Hans Robert Fritz Hahn (14 April 1914 – 18 December 1982) who was nicknamed "Assi" was a German Luftwaffe military aviator during World War II, a fighter ace credited with 108 enemy aircraft shot down in 560 combat missions.
He claimed 66 victories over the Western Front, of which 53 were Supermarine Spitfires.
Of the 42 victories he recorded over the Eastern Front, at least seven were Il-2 Sturmovik ground-attack aircraft.
Born in Gotha, Hahn volunteered for military service in the Wehrmacht of the Third Reich in 1934.
Initially serving in the Heer (Army), he transferred to the Luftwaffe (Air Force) in late 1935.
Following flight training, he was posted to Jagdgeschwader 134 "Horst Wessel" (JG 134—134th Fighter Wing) in April 1936.
In November 1937, Hahn was posted as a flight instructor to the Jagdfliegerschule (fighter flying school) at Werneuchen.
On 1 February 1939, he was transferred to the Stabstaffel of I.
Gruppe (1st group) of Jagdgeschwader 3 (JG 3—3rd Fighter Wing), based at Merseburg.
Hahn transferred to Jagdgeschwader 2 (JG 2—2nd Fighter Wing) "Richthofen" on 11 October 1939 and on 15 December, he was appointed Staffelkapitän (squadron leader) of 4.
Staffel of JG 2 "Richthofen".
There he claimed his first victory on 14 May 1940, during the Battle of France, over a Royal Air Force Hawker Hurricane fighter.
He claimed five victories during the French campaign and further victories during the Battle of Britain which led to the presentation of the Knight's Cross of the Iron Cross on 20 September 1940.
On 29 October 1940, Hahn took command of III.
Gruppe of JG 2 "Richthofen" as Gruppenkommandeur (group commander).
Following his 41st aerial victory he was awarded the Knight's Cross of the Iron Cross with Oak Leaves on 14 August 1941.
Legally, it was Germany's highest military decoration at the time of its presentation to Hahn.
On 16 September 1942, Hahn claimed his 66th and last victory on the Western Front.
Hahn was then appointed Gruppenkommandeur of II.
Gruppe of Jagdgeschwader 54 (JG 54—54th Fighter Wing) operating on the Eastern Front.
Over the next three months, he claimed 42 further victories, which included his 100th on 27 January 1943.
On 21 February 1943, Hahn made a forced landing following combat with Soviet fighters and was taken prisoner of war.
He remained in captivity until late 1950.
Following his release, Hahn wrote his memoirs "I Speak the Truth" (Ich spreche die Wahrheit) recounted his detailed life in Soviet captivity.
He then became a successful businessman before retiring in 1977 to the south of France.