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.

Born in Gotha, where he was educated at the Ernestine Gymnasium, in 1934 Hahn volunteered for military service in the Wehrmacht of the Third Reich.

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.

There he claimed his first victory on 14 May 1940, during the Battle of France, over a Royal Air Force Hawker Hurricane fighter.

On 21 February 1943, Hahn made a forced landing following combat with Soviet fighters and was taken prisoner of war.

Following his release, Hahn wrote his memoirs "I Speak the Truth" (Ich spreche die Wahrheit) recounted his detailed life in Soviet captivity.

A talented athlete, he was selected to participate in the 1936 Summer Olympics in Berlin in the Pentathlon, but he had to withdraw due to illness.

His friends initially nicknamed him "Hansi", a diminutive of his first name Hans, which over time was abbreviated and altered to "Assi".

[9][10] World War II in Europe began on Friday, 1 September 1939, when German forces invaded Poland.

Hahn claimed his first victory on 14 May 1940 over a Royal Air Force (RAF) Hawker Hurricane fighter.

[12] Together with Hauptmann Wolfgang Lippert, the presentation was made by Reichsmarschall Hermann Göring, the Commander-in-Chief of the Luftwaffe, at his residence Carinhall.

Hahn claimed his first aerial victory in his new capacity on 6 November when he shot down a Hurricane fighter southeast of Southampton.

[20] In May, the Gruppe converted to the Focke-Wulf Fw 190 A variant, a radial engine powered fighter aircraft.

He replaced Hauptmann Dietrich Hrabak who was transferred to command Jagdgeschwader 52 (JG 52—52nd Fighter Wing).

At the time, the Gruppe was based at Rjelbitzi Airfield, located 26 kilometers (16 miles) north of Dno and 15 kilometers (9.3 miles) west-southwest of Soltsy on the northern bank of the Shelon, an airfield south of Leningrad and west of Lake Ilmen on the Eastern Front.

[29] The transfer request had been made by Oberstleutnant Hannes Trautloft, the Geschwaderkommodore (wing commander) of JG 54, a friend of Hahn who appreciated his leadership qualities.

[30] Hahn claimed his first aerial victories on the Eastern Front on 4 December in the combat area southeast of Staraya Russa.

[36] Hahn documented his experiences as a prisoner of war upon his return in his narrative "I Speak the Truth" (Ich spreche die Wahrheit).

[37] According to his own account, on Sunday 21 February 1943, Hahn intended to fly to Riga for a meeting with the Luftflotte 1 (1st Air Fleet) commanding staff.

Since he had not planned to fly operationally, he did not wear his regular combat dress and did not carry a sidearm that day.

On his way to his aircraft, he ran into his wingman, Max Stotz, who informed him that the Heer (German Army) had just requested fighter support over the Demyansk combat area.

Disengaging from combat, Hahn's engine soon began overheating and he force-landed his Bf 109 G-2 (Werknummer 13949—factory number) in enemy territory south of Zaluchye.

He worked at the International Corporation of Bayer Leverkusen and later became a director of Wano Schwarzpulver Company, which manufactured gunpowder, at Kunigunde near Goslar.

He died of cancer on 18 December 1982 in Munich and was buried in Tirol, Austria with his lifelong friend Julius Meimberg speaking at the memorial service.