By Stephen Robinson

There was not too much dogfighting for us. It requires a large area and is absolutely defensive.[1]

Erich Hartmann

Colonel John R. Boyd flew F-86 Sabres during the Korean War and later theorised the Observation-Orientation-Decision-Action (OODA) loop, initially focused on air-to-air combat. At first, Boyd considered the tactical requirements of test flight dogfights between the YF-16 and YF-17 prototypes in 1974 before analysing Sabre and MiG-15 combat in Korea. He expressed the basic idea of the OODA loop in a United States Air Force (USAF) oral history in 1977, although it was not fully formed with its familiar four stages.[2] However, it is not commonly known that another F-86 pilot had theorised a four-stage air-to-air combat ‘decision cycle’ in the 1940s – Luftwaffe pilot Erich Hartmann.

During the Second World War, Hartmann flew 1,404 combat missions, participated in 825 air-to-air engagements and became history’s highest-scoring ace with 352 official kills, mainly over the Eastern Front.[3] During the Cold War, he later commanded West Germany’s first Sabre wing Jagdgeschwader 71 ‘Richthofen.’[4] Hartmann theorised the ‘Coffee Break’ concept, abbreviated as See-Decide-Attack-Break (SDAB). Writets Trevor J. Constable and Raymond F. Toliver articulated the idea in their bestseller The Blond Knight of Germany (1970), the first Hartmann biography, almost half a decade before the OODA loop emerged. Although their book romanticises the German military and fails to address Hartmann’s relationship with National Socialism adequately, it accurately depicts air combat tactics. In contrast, historian Erik Schmidt’s Black Tulip: The Life and Myth of Erich Hartmann, the World’s Top Fighter Ace (2020) thoroughly examines Hartmann’s role in the Third Reich and his fighter pilot career, which makes his book essential reading.

Hartmann and Boyd, in addition to flying Sabres and developing ‘decision cycles’, had much else in common. They were both aggressive fighter pilots with maverick independent streaks who declared war on their hierarchy late in their careers. Hartmann rebelled by opposing the F-104 Starfighter, which he considered unsafe, while Boyd went outside his chain of command to develop the unwanted Lightweight Fighter project.[5] Both men also retired as colonels in the 1970s.

At first glance, the SDAB cycle and the OODA loop are hard to distinguish. As John Stillion expressed: ‘Hartmann’s air combat procedure is strikingly similar to USAF Colonel John Boyd’s famous Observe, Orient, Decide, Act, or “OODA” loop.’[6] However, there is a critical difference. In an air combat context, the OODA loop is about winning dogfights, while the SDAB cycle is all about avoiding them. Additionally, Boyd’s OODA loop theory evolved from air combat to include land combat and then conflict in general before becoming a cognitive model explaining the mind’s relationship with reality. Hartmann’s method, as Schmidt concluded, is not ‘really a dogfighting strategy per se. It was more of an anti-dogfighting strategy.’[7]

Take a Coffee Break

Hartmann enlisted in the Luftwaffe in 1940 and joined Jagdgeschwader 52 in October 1942, flying Messerschmitt Bf 109 fighters. He initially became a wingman for Edmund Rossmann, who mentored the novice pilot. Rossmann had already been credited with over 80 kills, giving his advice considerable merit.[8] Hartmann learned that Rossmann had a wounded arm that prevented him from flying highly manoeuvrable dogfights, but he compensated for this injury by developing a specific tactic. After spotting the enemy, Rossmann patiently assessed the situation before deciding whether to attack. If he decided that surprise could be achieved, he would attack, which differed from the standard practice of immediately attacking a seen enemy.[9] Hartmann later reflected that Rossmann ‘taught me the basic technique of the surprise attack, without which I am convinced I would have become just another dogfighter.’[10] What Rossmann did out of necessity, Hartmann would soon do out of choice.

Hartmann scored his first aerial victory on 5 November 1942 by shooting down an Il-2 Sturmovik. However, shrapnel from the kill damaged his engine, forcing him to crash. While recovering in the hospital, Hartmann began to formulate his conception of air combat after reflecting that he should have approached closer before opening fire and disengaged quicker to prevent shrapnel from hitting his engine. Hartmann later recalled: ‘I learned two things that day: Get in close and shoot, and break away immediately after scoring the kill.’[11] Hartmann later formulated his trademark method, as Constable and Raymond explained:

The magical four steps were: “See – Decide – Attack – Reverse, or ‘Coffee Break’.” In lay terms, spot the enemy, decide if he can be attacked and surprised, attack him and break away immediately after striking; or if he spots you before you strike, take a “coffee break” – wait – pull off the enemy and don’t get into a turning battle with a foe who knows you are there.[12]

In a USAF interview in 1985, Hartmann was asked, “How did you develop your tactics of See, Decide, Attack, Reverse, or Coffee Break?” He answered:

I developed my tactics by watching my leader. My first leader, MSgt Eduard Rossmann, was always cautious. He said he didn’t like to pull a lot of Gs because of a bad shrapnel wound in his arm. He would look over each fight and decide if he would enter. When he did enter, it was always straight through – no turns – and he usually came home with a kill. My next leader, Sgt Hans Dammers, liked to turn and fly in the circus. The next man, 1st Lt Josef Swernemann was somewhere in between the two. He would be patient for a while, but then would get into a turning fight when he got frustrated. This is when I realized you must fight with your head, not your muscle.[13]

Hartmann rejected dogfighting as he considered it pointless and risky: ‘I also decided against aerial acrobatics, against what traditional pilots would call dog-fighting […] Acrobatics are a waste of time and therefore dangerous.’[14] Hartmann would always try to break contact after a pass before deciding if another pass was warranted and, as Constable and Raymond explained, ‘[e]ach pass was a repetition of the “See – Decide – Attack – Break” cycle.’[15]

Hartmann’s method was essentially hit-and-run tactics. As social scientists C. Hind and A. Nicolaides explained: ‘Hartmann became the ultimate and leading exponent of the stalk-and-ambush tactics, and he favoured the tactic of ambushing enemy aircraft and firing at them from very close range, about 20 m, rather than becoming involved in challenging and unnecessary dogfights.’[16]

The SDAB cycle is usually only mentioned in popular military aviation histories and is rarely referred to in scholarship. Edward E. Eddowes, who worked at the Air Force Human Resources Laboratory, submitted a paper to the First Symposium on Aviation Psychology in 1981. He declared: ‘Each engagement involves repetitions of the see, decide, attack, break discrimination-decision sequence. Like many of his predatory predecessors, Hartmann found turning contests hazardous and avoided them.’[17]

In another example, Captain James H. Patton, Jr., a retired naval officer, in his article ‘Stealth is a Zero-Sum Game: A Submariner’s View of the Advanced Tactical Fighter’ considered the SDAB cycle in 1991:

Top Gun instructors interpreted that terse guidance – based on interviews with Hartmann – to mean that a pilot should attempt to detect without being detected, judge whether he can attack covertly, close to a point that would almost assure a kill, and then disengage rapidly to repeat the process, rather than hang around in what submariners call a melee, and fighter pilots term the visual fur ball.[18]

Mikel D. Petty and Salvador E. Barbosa conducted an interesting air simulation experiment. They noted that USAF instructors supervise trainees undergoing virtual simulation-based training.[19] However, given the limited availability of instructors, they devised a means of testing a self-study-based training approach through simulation by following the progress of one test subject over eight years. The virtual pilot flew 2,950 missions in 138 campaigns using seven types of aircraft set in Europe in 1943-45 using Microsoft Combat Flight Simulator 3 (CFS3). The experiment required the subject to read air combat literature before applying the described tactics in the simulation. The study material included The Blond Knight of Germany, which outlined the SDAB cycle.[20] Petty and Barbosa confirmed the effectiveness of the SDAB cycle as ‘maneuvers and tactics described as effective in WWII air combat in the literature, e.g., those in Franks (1998) and Toliver and Constable (1970), were found by the subject to be very effective in CFS3 as well, if performed correctly.’[21]

The SDAB cycle has limitations, and Schmidt correctly concluded that it was well-suited to the Eastern Front but had less utility in Western Europe: ‘Hartmann’s Soviet enemies were, generally, less capable than the British and American pilots on the Western Front, which meant not only that they were easier to shoot down, but also that they were easier to evade and disengage from if the odds weren’t right.’[22] Therefore, applying SDAB cycles consistently in practice is impossible, and some dogfighting is inevitable, making the OODA loop relevant.

The OODA Loop

Boyd was familiar with Hartmann and mentioned him once in the 1977 USAF oral history stating that ‘[A]nd so, in that sense, a guy like Hartmann or a guy like Bong [Maj Richard I.] and some of these other good American aces – I could name others from other countries – they kind of knew they were going to win anyway. Maybe not in the beginning, but they built up that certain confidence and they had the desire.’[23] However, it is unclear if he read The Blond Knight of Germany or other references to the SDAB cycle, so we do not know if Hartmann influenced the OODA loop.[24] In any case, both models are opposites, so there is no suggestion of plagiarism. The basic idea of the OODA loop is to move faster than the enemy through a four-stage cycle, as military analyst Franklin C. Spinney, a close acolyte of Boyd, explained:

He [Boyd] thought that any conflict could be viewed as a duel wherein each adversary observes (O) his opponent’s actions, orients (O) himself to the unfolding situation, decides (D) on the most appropriate response or countermove, then acts (A). The competitor who moves through this OODA-loop cycle the fastest gains an inestimable advantage by disrupting his enemy’s ability to respond effectively.[25]

The victor, moving faster, seizes the initiative while the loser becomes paralysed by disorientation and panic.[26] The winner gets inside the loser’s OODA loop, which allows the pilot to manoeuvre into a winning firing position during a dogfight.[27] The OODA loop requires both pilots to dogfight long enough and complete enough loops for the winner to gain a relative speed advantage, which begins to sow disorientation and panic in the loser’s mind. More specifically, the pilots must complete enough OODA loops for the winner’s relative speed advantage to result in an action that changes the overall situation.[28] When this occurs, the loser’s actions, based upon the superseded earlier situation, fail to achieve the intended result, and they become confused as negative feedback overloads their brain. A pilot simply shooting down an enemy Hartmann-style before a clash of opposing OODA loops can occur is not applying Boyd’s model. If the OODA loop involved surprise and winning before the opponent reacts, there would be nothing original about the idea or way to distinguish it from the earlier SDAB cycle meaningfully.

The key difference between Hartmann and Boyd is that the SDAB cycle avoids dogfighting while the OODA loop requires dogfighting. Boyd was fixated on dogfighting as Frans P.B. Osinga explained: ‘[H]e [Boyd] developed the ability to see air combat as a contest of moves and countermoves in time, a contest in which a repertoire of moves and the agility to transition from one to another quickly and accurately in regard [to] the opponent’s options was essential.’[29]

Boyd’s manual Aerial Attack Study (1964), first published in 1960, explained all possible dogfighting manoeuvres without prescribed solutions.[30] Osinga concluded that Boyd ‘wanted to show people various moves and countermoves, and the logic of its dynamic.’[31] Aerial Attack Study reads like a chess strategy book. It is undoubtedly valuable, as Grant Hammond explained: ‘[M]any a fighter pilot, whether he knows it or not, owes his life to Boyd and the development of the tactics and manoeuvres explained in that manual.’[32] Former students who fought in Vietnam credit Boyd’s teaching for getting them out of danger. For example, on 4 April 1965, Major Vernon M. Kulla engaged North Vietnamese MiG-17s while flying an F-105 Thunderchief. Before the MiG-17 could open fire, Kulla successfully conducted a snap roll that he learned from Boyd, forcing the communist pilot to overshoot.[33] Therefore, Boyd certainly taught useful air-to-air tactical skills.

Despite Boyd’s obsession with dogfighting, it is rarer than many assume. Historically speaking, in most cases, victory goes to the pilot, who spots the enemy first and wins before the opponent can react. As Barry D. Watts explained:

To start with historical combat data, combat experience going at least back to World War II suggests that surprise in the form of the unseen attacker has been pivotal in three-quarters or more of the kills. For example, P-38 pilot Lieutenant Colonel Mark Hubbard stressed that, in his experience over northern Europe with the U.S. Eighth Air Force, “90% of all fighters shot down never saw the guy who hit them.” Similarly, the German Me-109 pilot Erich Hartmann […] has stated that he was “sure that eighty percent” of his kills “never knew he was there before he opened fire.”[34]

This trend continued during the Vietnam War from April 1965 to January 1973, as approximately 80 per cent of personnel shot down from both sides never saw the other aircraft or had insufficient time to make a countermove.[35] Accordingly, Watts concluded: ‘[W]hat historical air combat experience reveals, therefore, is that upwards of 80 per cent of the time, those shot down were unaware that they were under attack until they either were hit or did not have time to react.’[36]

Most air-to-air kills did not involve dogfighting and, consequently, clashes of opposing OODA loops involving sequences of moves and countermoves. Most air-to-air engagements end before the loser has time to act. Even when dogfighting occurs, it can be over in seconds, as Schmidt explained:

Amazingly, the whole dance of a dogfight could take place over the course of just a few seconds. The famed American pilot Robin Olds, who flew P-38s and P-51s in World War II and F-4 Phantoms in Vietnam, said: “Usually in the first five seconds of a dogfight, somebody dies. Somebody goes down. You want to make sure it’s the other guy.”[37]

Therefore, the OODA loop is not always applicable in dogfights because other factors often decide the outcome before the winner’s faster speed can generate negative feedback in the loser’s mind, which is a more gradual process involving moves and countermoves.

Boyd, without intending to, contradicted the essence of the OODA loop by expressing a sentiment identical to the SDAB cycle:

So that’s why he [the fighter pilot] wants to pick and choose engagement opportunities. He wants to get in, get out, get in, and get out. Why does he want to do that? Because it’s not just one-to-one air-to-air combat up here. It’s what the pilots like to say, many-upon-many. In other words, if you’re working over one guy, somebody else is going come in and blindside you. So you want to spend as little time with a guy as possible. You need to get in, gun him, and get the hell out.[38]

Ironically, Boyd preferred the hit-and-run essence of the SDAB cycle, as picking and choosing engagement opportunities and cycles of getting in and out to avoid danger sounds just like Hartmann. Therefore, engaging in an elongated OODA loop duel with another pilot is inherently risky due to the possible presence of other enemy fighters. However, there is still a critical difference as Boyd believed that the best way to break contact was by conducting a ‘fast transient’ – a rapid transition from one manoeuvre to another that allows a pilot to kill before quickly disengaging.[39] However, a pilot can only conduct a ‘fast transient’ if they are already in a dogfight. Hartmann instead preferred to dive at an unsuspecting enemy using superior speed in a single pass and then to use the momentum gained to break contact without any acrobatics, dogfighting or ‘fast transients’.

Boyd also stressed: ‘[T]hink of it in space and time. In space, you’re trying to stay inside his manoeuvre; in time, you want to do it over a very short period of time, otherwise you’re going to become vulnerable to somebody else.’[40] Therefore, Boyd advocated elongated OODA loop duels to gradually generate negative feedback while inconsistently wanting to restrict engagements to minimal periods due to the risk of other enemy fighters. Ultimately, Boyd failed to reconcile the need to rapidly break contact after an attack to avoid danger with the time required for enough OODA loop cycles to generate disorientation and panic in the loser’s mind.

Aces and Iteration

The key advantage of the SDAB cycle is that it minimises risk. However, a pilot intending a surgical hit-and-run strike may inadvertently find themselves in a dogfight, and then the logic of the OODA loop might become paramount. Nevertheless, engaging in an OODA loop contest inherently makes one vulnerable. As Jim Storr explained: ‘[T]here is considerable advantage in reacting faster than one’s opponent, but the OODA Loop does not adequately describe the process. It places undue emphasis on iteration instead of tactically decisive action.’[41] After attacking, Hartmann would break contact to prevent iteration and only committed to further passes in favourable conditions. The avoidance of iteration is also evident in the tactical methods of other aces, and Storr stressed that ‘biographies of aces […] show almost no trace of iterative behaviour in combat.’[42] Hartmann’s tactics worked because he avoided dogfighting. As Storr similarly expressed:

Critically, aces scarcely ever dogfight. They usually destroy enemy aircraft with a single pass, and expend very little ammunition per aircraft shot down. Their effectiveness centres on rapid, decisive decision and action. It is based on superlative, largely intuitive, situational awareness. Aces do display some significant characteristics – their eyesight is usually exceptional and their shooting phenomenal. They also have catlike reactions. However, expert fighter combat is fundamentally not iterative. It is sudden, dramatic and decisive.[43]

Boyd valued manoeuvrability over speed, while Hartmann preferred speed over manoeuvrability. Neither is right or wrong, and there is undoubtedly a degree of pilot preference. Hartmann’s approach was only made possible by exceptional eyesight, which allowed him to apply successful SDAB cycles consistently. Understandably, pilots with poorer eyesight might prefer manoeuvrability. After all, most pilots never become aces, so there is value in applying lessons from both Hartmann and Boyd’s approaches.

Conclusion

Boyd advocated getting inside the enemy’s OODA loop to disrupt their decision-making process and force them to make defeat-inducing inappropriate actions. In contrast, Hartmann had no intention of getting inside the enemy’s ‘decision cycle’. He usually won before the enemy knew of his presence or had time to act. There is no need to disrupt the enemy’s decision-making process if they have no time or opportunity to make decisions, and in such circumstances, the OODA loop is redundant. As such, Boyd neglected the importance of who spots who first and the corresponding likelihood that most engagements will be decided before sequences of moves and countermoves can occur.

Of course, manoeuvrable dogfighting cannot always be avoided, so the OODA loop certainly has merit. For example, an F-35 Lightning II would ideally only shoot down unsuspecting enemy fighters with long-range missiles beyond visual range. However, it is armed with 25mm cannons just in case dogfighting occurs. Nevertheless, air-to-air engagements have declined since the Vietnam War, while situational awareness has dramatically increased due to improved radar and airborne early warning and control (AEW&C) platforms. Therefore, the ratio of air-to-air kills occurring beyond visual range will likely continue to increase. Consequently, the future of OODA loop-style dogfighting is uncertain but becoming increasingly rare. At the same time, the core of Hartmann’s method remains valid. Pilots can now ‘see’ at great range with radar and ‘decide’ whether to ‘attack’ with the assistance of AEW&C. However, there may be no need for a clean ‘break’ since pilots no longer must get close thanks to long-range missiles.

The OODA loop depicts air-to-air combat as a duel between two minds going through cycles in which both pilots have a ‘sporting chance’, which reflects the ‘Knights of the Air’ myth from the First World War.[44] In contrast, Hartmann was like a sniper, describing his preferred tactic as ‘[C]oming out of the sun and getting close; dog-fighting was a waste of time. The hit and run with the element of surprise served me well, as with most of the high scoring pilots.’[45] Boyd, in contrast, is like a chess enthusiast who loves the moves and countermoves of the game. However, OODA loop-like dogfights only occur in a minority of air-to-air encounters. Therefore, Boyd’s model only has limited utility in air combat.

The SDAB cycle demonstrates that the OODA loop is not the only ‘decision cycle’. Despite its impeccable origins in combat experience, Hartmann’s tactical method is not well-known today partly because he never transformed the SDAB cycle into a general theory of conflict. In contrast, Boyd considered the more abstract OODA loop to be a universal guide to military success, applicable beyond the air domain at all levels of conflict. Boyd also believed that the OODA loop explained any competitive endeavour – such as politics, business, and sports – as well as human cognitive processes and behaviour in general. As Osinga explained concerning Boyd’s final version of the OODA loop: ‘[I]t is a model of individual and organizational-level learning and adaptation processes, or – to use Boyd’s own terms – a meta-paradigm of mind and universe, a dialectic engine, an inductive-deductive engine of progress, a paradigm for survival and growth, and a theory of intellectual evolution.’[46] Hartmann never transformed his straightforward air-to-air tactic into something grander. Another reason the SDAB cycle is not well-known is that Hartmann did not devote his retirement to promoting the concept: ‘I instructed and flew at a few air clubs, and flew in an aerobatics team with Dolfo Galland. Later I just decided to relax and enjoy life.’[47] In contrast, Boyd spent much of his retirement expanding, refining and disseminating his theories, including the OODA loop.

Boyd considered the OODA loop a universal and unchangeable fact of life – we have OODA loops whether we like it or not, and that is the model that best explains our relationship with reality.[48] Therefore, Boyd became imprisoned by totalising thinking while Hartmann didn’t, primarily because he never overanalysed his model. The SDAB cycle was an artificial way of thinking based on experience and circumstance. Hartmann demonstrates that we can manufacture our own ‘decision cycles’ through trial and error, tailoring them to meet specific needs and requirements. He also reminds us that ‘decision cycles’ do not have to be grand cognitive models. Above all, we are free to choose and experiment as Hartmann did. Numerous ‘decision cycles’ can coexist with different strengths and weaknesses. Therefore, it makes no sense to select one model for every situation.

Although the OODA loop (dogfighting) and the SDAB cycle (anti-dogfighting) are opposites, they can be complementary when synthesized. The OODA loop and the SDAB cycle become the opposite ends of a broad spectrum of options between those extremes. Most pilots probably operate somewhere between those two poles, taking their talents, aircraft characteristics, and specific circumstances into account. Boyd would favour synthesising the OODA loop and the SDAB cycle because doing so precisely aligns with the dialectical logic he expressed in his enlightening article Destruction and Creation (1976).[49] He also championed synthesis through his snowmobile allegory in his remarkable briefing, The Strategic Game of ? and ?.[50] The allegory is a thought experiment involving the image of a skier, a motorboat, a bicycle and a toy tractor. All these concepts can be broken down into sub-components through a destructive process, resulting in skis, motorboat engines, bicycle handlebars and rubber treads. These useful sub-components from different origins can then be reassembled into something new through a creative process, resulting in a new concept – a snowmobile. Boyd never stated that his ideas are exempt from the dialectical logic of destruction and creation. Therefore, subjecting the OODA loop to destruction and creation is inherently positive and can offer new insights into air combat.

Stephen Robinson is an officer in the Australian Army Reserve currently serving in the Australian Army History Unit. He is the author of False Flags: Disguised German Raiders of World War II (2016), Panzer Commander Hermann Balck: Germany’s Master Tactician (2019), The Blind Strategist: John Boyd and the American Art of War (2021) and Eight Hundred Heroes: China’s Lost Battalion and the Fall of Shanghai (2022).

Header image: A Canadair Sabre at the Militärhistorisches Museum der Bundeswehr – Flugplatz Berlin-Gatow in Hartmann markings from when he commanded JG71, c. 2007 (Source: Wikimedia)

[1] Quoted in Edward H. Sims, Fighter Tactics and Strategy 1914-1970 (New York: Harper and Row, 1972), p. 208.

[2] Boyd referred to the ‘observation-decision-action time scale’ in the interview, which is not yet the familiar OODA loop since it lacks the orientation stage. United States Air Force Historical Research Center, U.S. Air Force Oral History Interview, K239.0512-1066, Colonel John R. Boyd, Corona Ace, 28 January 1977, p. 132.

[3] Erik Schmidt, Black Tulip: The Life and Myth of Erich Hartmann, the World’s Top Fighter Ace (Philadelphia, PA: Casemate Publishers, 2020), p. xiii.

[4] Schmidt, Black Tulip, p. 130.

[5] Schmidt, Black Tulip, p. 134; Robert Coram, Boyd: The Fighter Pilot Who Changed the Art of War (New York: Hachette Book Group, 2002), p. 244.

[6] John Stillion, Trends in Air-to-Air Combat: Implications for Future Air Superiority (Washington DC: Center for Strategic and Budgetary Assessments, 2015), p. 6.

[7] Schmidt, Black Tulip, p. 64.

[8] Philip Kaplan, Fighter Aces of the Luftwaffe in World War II (Barnsley: Pen and Sword Books, 2007), p. 192.

[9] Trevor J. Constable and Raymond F. Toliver, The Blond Knight of Germany (New York: Ballantine Books, New York, 1970), pp. 43-4.

[10] Quoted in Kaplan, Fighter Aces of the Luftwaffe in World War II, p. 195.

[11] Colin D. Heaton, ‘Final Thoughts of the Blond Knight,’ World War II 17, no. 3 (2002), p. 33.

[12] Constable and Toliver, The Blond Knight of Germany, p. 55.

[13] Rich Martindell and Bill Mims, ‘An Interview with Erich Hartmann, the Ace of Aces,’ in Tac Attack (Washington DC: Department of the Air Force, 1985), p. 23.

[14] Quoted in William Tuohy, ‘German Pilot Reported 352 Kills Hope of Top WWII Flier: No Need for New Air Aces,’ Los Angeles Times, 3 January 1986.

[15] Constable and Toliver, The Blond Knight of Germany, p. 86.

[16] C. Hind and A. Nicolaides, ‘Ace of Aces: Erich Hartmann the Blond Knight of Germany,’ Open Journal of Social Sciences 8 (2020), pp. 388-9.

[17] Edward E. Eddowes, ‘Measuring Pilot Air Combat Maneuvering Performance’ in First Symposium on Aviation Psychology (The Ohio State University Columbus: The Aviation Psychology Laboratory, 1981), p. 340.

[18] James H. Patton, Jr., ‘Stealth is a Zero-Sum Game: A Submariner’s View of the Advanced Tactical Fighter,’ Airpower Journal 5, no. 1 (1991), p. 7.

[19] Mikel D. Petty and Salvador E. Barbosa, ‘Improving Air Combat Maneuvering Skills Through Self-Study and Simulation-Based Practice,’ Simulation & Gaming 47, no. 1 (2016), p. 105.

[20] Petty and Barbosa, ‘Improving Air Combat Maneuvering Skills,’ p. 111.

[21] Petty and Barbosa, ‘Improving Air Combat Maneuvering Skills,’ p. 123.

[22] Schmidt, Black Tulip, p. 64.

[23] U.S. Air Force Oral History Interview, p. 240.

[24] In addition to The Blond Knight of Germany, Boyd may have read Edward H. Sims’ Fighter Tactics and Strategy 1940-1970 (1972), which also explained the SDAB cycle before the OODA loop emerged. Sims, Fighter Tactics and Strategy, 204-5

[25] Franklin C. Spinney, ‘Genghis John,’ Proceedings 123 (1997).

[26] Boyd advised in ‘Organic Design for Command and Control’ to operate inside enemy OODA loops ‘to enmesh adversary in a world of uncertainty, doubt, mistrust, confusion, disorder, fear, panic chaos.” Boyd also added in ‘The Strategic Game of ? and ?’: “Operating inside their OODA loops will accomplish just this by disorienting or twisting their mental images so that they can neither appreciate nor cope with what’s really going on.’ John R. Boyd, ‘Organic Design for Command and Control’ and ‘The Strategic Game of ? and ?,’ in Grant T. Hammond (ed), A Discourse on Winning and Losing (Maxwell AFB: Air University Press, 2018), p. 224 and 302.

[27] Boyd, towards the end of his life, refined the OODA loop into a vastly more complex idea involving multiple feedback loops and different relationships and pathways between the four stages. However, the idea of getting inside the enemy’s OODA loop and gaining a relative speed advance is evident in the earlier basic OODA loop and the final complex OODA loop. This key idea remained constant during the OODA loop’s evolution. Therefore, when referring to the OODA loop in this article, all versions of the OODA loop are referred to unless otherwise specified.

[28] U.S. Air Force Oral History Interview, p. 134.

[29] Frans P.B. Osinga, Science, Strategy and War: The Strategic Theory of John Boyd (New York: Routledge, 2006), p. 28.

[30] John R. Boyd, Aerial Attack Study, 50-10-6C, 1964.

[31] Osinga, Science, Strategy and War, p. 22.

[32] Grant Hammond, The Mind of War: John Boyd and American Security (Washington DC: Smithsonian Books, 2001), p. 80.

[33] Thomas McKelvey Cleaver, Going Downtown: The US Air Force over Vietnam, Laos and Cambodia, 1961-75 (Oxford: Osprey Publishing, 2022), p. 102.

[34] Barry D. Watts, Doctrine, Technology, and War, Air & Space Doctrinal Symposium Maxwell AFB, Montgomery, Alabama 30 April-1 May 1996.

[35] Watts, Doctrine, Technology, and War.

[36] Watts, Doctrine, Technology, and War.

[37] Schmidt, Black Tulip, p. 69.

[38] John R. Boyd, ‘Patterns of Conflict (Transcript),’ in Discourse on Winning and Losing, Marine Corps University, Quantico, 25 April, 2 May, 3 May 1989, p. 10.

[39] Boyd, ‘Patterns of Conflict (Transcript),’ p. 10.

[40] Boyd, ‘Patterns of Conflict (Transcript),’ p. 10.

[41] Jim Storr, The Human Face of War (London: Bloomsbury Publishing 2009), p. 13.

[42] Storr, The Human Face of War, p. 13.

[43] Storr, The Human Face of War, p. 13.

[44] For a comprehensive analysis of Boyd’s relationship with the ‘Knights of the Air’ myth, see Michael W. Hankins, Flying Camelot: The F-15, the F-16, and the Weaponization of Fighter Pilot Nostalgia (Ithaca, NY: Cornell University Press, 2021).

[45] Heaton, ‘Final Thoughts of the Blond Knight,’ p. 33.

[46] Frans P. B. Osinga, ‘The Enemy as a Complex Adaptive System: John Boyd and Airpower in the Postmodern Era,’ in John Andreas Olsen (ed.), Airpower Reborn: The Strategic Concepts of John Warden and John Boyd (Annapolis, MD: Naval Institute Press, 2015), p. 74.

[47] Heaton, ‘Final Thoughts of the Blond Knight,’ p. 85.

[48] Boyd explained in Patterns of Conflict: ‘It doesn’t make any difference whether you’re a Russian, you’re an Englishman, an American, Chinese or what. You have to observe what the hell’s going on here. Then you have to, as a result of that, looking at the world, you generate images, views, and impressions in your mind. That’s what you call orientation. Then as a result of those images, views, and impressions, you’re going have to make a selection, what you’re going to do or what you’re going to do, that’s a decision. And then you’re going to have to implement or take the action.’ Boyd, ‘Patterns of Conflict (Transcript),’ p. 11.

[49] John R. Boyd, Destruction and Creation (Paper), 3 September 1976, pp. 2-3.

[50] Boyd, ‘The Strategic Game of ? And ?,’ pp. 261-5.