Americans in the French Air Service.

Lafayette Escadrille - American volunteers in the French Air Service during World War I.

Suffering multiple wounds, he was declared unfit for infantry service and transferred to the French Air Service, gaining his pilot's brevet in March 1916.

When World War I broke out, Pourpe joined the French Air Service, serving with Escadrille N.23.

The first true Air Ambulance flight was made when a Serbian officer was flown from the battlefield to hospital by a plane of the French Air Service.

The French Air Service originated the use of roundels on military aircraft during the First World War.

In 1917, the French Air Service finally issued an official specification for a camouflage scheme.

Over the Front: A Complete Record of the Fighter Aces and Units of the United States and French Air Services, 1914-1918.

This was a squadron of American volunteer pilots who had joined the French Air Service prior to the United States entry into the war on 6 April 1917.

Serving in the French Air Service, he was the oldest ace in the war, scoring his fifth (and sixth) victories when he was 43 years of age.