U.S.A.F.
or USAF
United States Air Force.
Definition for usaf (2 of 2)
United States Air Force
noun
the permanent or regular military air force of the United States, established in 1947 as a separate service under the authority of the Department of Defense: a branch of the U.S. Army before 1947. Abbreviation: USAF
British Dictionary definitions for usaf
USAF
abbreviation for
United States Air Force