The Department of the Air Force was made a separate department in DoD in 1949. Previously, it existed as the Army Air Force under the Department of the Army.
Government Documents holds an extensive collection of Air Force publications, including the following series:
Annual reports (D 301.1:)
Airpower review/Air University review (D 301.26:)
U.S. Air Force historical series (D 301.26/19:)
U.S. Air Force lithograph series (D 301.76)
Airman: official journal of the Air Force (D 301.60:)
Hawaii Records Depository Photos: Women Air Force Service Pilots
We also have a variety of technical reports, general publications, pamphlets, and other Air Force materials.