91st Aero Squadron

91st Aero Squadron
Lt. Everett Richard Cook, Commanding Officer, 91st Aero Squadron, standing beside his Spad VIII aircraft, 1918
Active	21 August 1917-Present
Country	United States
Branch	Air Service, United States Army
Role	Observation
Size	Squadron
Part of	American Expeditionary Forces (AEF)
Engagements	World War I Occupation of the Rhineland
Decorations	French Croix de Guerre with Palm
Commanders
Notable commanders	Maj. John N. Reynolds Lt. Everett R. Cook
Insignia
91st Aero Squadron emblem
Aircraft flown
Fighter	Spad XIII, 1918-1919
Reconnaissance	Avion de Reconnaissance 1 and 2 (AR 1 AR 2), 1918 Breguet 14, 1918-1919 Salmson 2A2 1918-1919 De Havilland DH-4, 1918-1919
Trainer	Curtiss JN-4, 1917

First Army Observation Group
Western Front, France: 7 May-11 November 1918

Air Aces: 4

The 91st Aero Squadron was a Air Service, United States Army unit that fought on the Western Front during World War I. The 91st was one of the first five American flying squadrons to arrive in France, arriving at Chaumont Aerodrome on 15 November 1917.

The squadron was assigned as an Army Observation Squadron, performing long-range, strategic reconnaissance over the entire length of the United States First Army sector of the Western Front in France. After the 1918 Armistice with Germany, the squadron was assigned to the United States Third Army as part of the Occupation of the Rhineland in Germany. It returned to the United States in June 1919 and became part of the permanent United States Army Air Service in 1921, being re-designated as the 91st Squadron.

The current United States Air Force unit which holds its lineage and history is the 91st Network Warfare Squadron, assigned to the 67th Network Warfare Wing, Kelly Field Annex, Lackland Air Force Base, Texas.

The squadron was formed on 21 August 1917 at Kelly Field, Texas, composed of detachments from Fort Sill, Oklahoma, Fort Leavenworth, Kansas, Jefferson Barracks, Missouri, and Fort Sam Houston, Texas. The squadron, after basic flight training at Kelly Field in Curtiss JN-4 "Jenny" trainers left for the Aviation Concentration Center at Camp Mills, Garden City, New York on 30 September. Arriving on 5 October, the squadron spent several uneventful weeks waiting for overseas transport.