In May 1917, he obtained a citation for "taking command of his unit, and by his energetic intervention will, brought the unfolding of the enemy" while he was the only ranked surviving of his section.

Designated Sous-Lieutenant by battlefield promotion under fire, Geille, upon his request, joined the Military Aeronautics (French: l'Aéronautique militaire) in 1917.

Designated definitely as a Sous-Lieutenant, he went to Poland in the corps of the Escadrille SAL 39, with the Blue Army of general Józef Haller, then engaged against Soviet Russia.

Nevertheless, an event evoked his interests: in 1934, in front of numerous foreign observers, the Soviets conducted a parachute jump, in the region of Kiev, of two battalions - with light artillery means - which, within the cadres of the grand maneuver, were able to apprehend a small town which was designated for them.

Nevertheless, both Captains Geille and Durieux (both pilots) as well battalion chief (French: chef de bataillon) Chalret du Rieu obtained to be sent to the USSR to study the techniques of Russian Soviet Jumps.

A candidate at the School of Tuchino, near Moscow, Frédéric Geille obtained the brevet of chief paratrooper instructor number 3 (French: instructeur en chef de parachutisme n°3).

The Soviet Officer accordingly examined the suspension lines and canopy of the defected exemplary, refolded the chute before boarding the aircraft and jumped with it.

Promoted Commandant in 1937, he realized two records the same year: that of a "saut à l'arraché" of thirty five meters of height and that of twelve jumps in one hour and forty five minutes.

Recalled to activity, he was designated as a Colonel on 25 June 1943 and took command of the 1st Parachute Chasseur Regiment 1er RCP at Fez on 1 July 1943, which he led under fire during the Liberation of France.

Assigned to the general staff headquarters of the French Air Force on 25 November 1944, he was delegated two important tasks: The end of the war in Europe stopped his works.

Commander of the Légion d'honneur, titled of more than eight citations, and inventor of the actual French « Chuteurs Opérationnels, Colonel Geille died on 21 July 1976 at Saint-Germain-en-Laye.