U.S. Army Air Service

Air Service, United States Army
"Prop and Wings" branch insignia of the Air Service
Active	May 24, 1918 – July 2, 1926
Country	United States of America
Branch	United States Army
Type	Air force
Role	Aviation support to ground operations
Size	195,024 men, 7,900 aircraft (1918) 9,954 men, 1,451 aircraft (1926)
Garrison/HQ	Munitions Building, Washington, D.C.
Engagements	World War I
Commanders
Notable commanders	Mason Patrick

The Air Service, United States Army (also known as the "Air Service", "U.S. Air Service" and after its legislative establishment in 1920, the "U.S. Army Air Service") was the military aviation service of the United States between 1918 and 1926 and a forerunner of the United States Air Force. It was established as an independent but temporary branch of the U.S. War Department during World War I by two executive orders of President Woodrow Wilson: on May 24, 1918, replacing the Aviation Section, Signal Corps as the nation's air force; and March 19, 1919, establishing a military Director of Air Service to control all aviation activities. Its life was extended for another year in July 1919, during which time Congress passed the legislation necessary to make it a permanent establishment. The National Defense Act of 1920 assigned the Air Service the status of "combatant arm of the line" of the United States Army with a major general in command.

In France, the Air Service of the American Expeditionary Force, a separate entity under commanding General John J. Pershing that conducted the combat operations of U.S. military aviation, began field service in the spring of 1918. By the end of the war, the Air Service used 45 squadrons to cover 137 kilometers (85 miles) of front from Pont-à-Mousson to Sedan. 71 pursuit pilots were credited with shooting down five or more German aircraft while in American service. Overall the Air Service destroyed 756 enemy aircraft and 76 balloons in combat. 17 balloon companies also operated at the front, making 1,642 combat ascensions. 289 airplanes and 48 balloons were lost in battle.