WordNet (r) 3.0 (2006):

air force
    n 1: the airborne branch of a country's armed forces [syn: air
         force, airforce]
    2: the airforce of the United States of America; the agency that
       defends the United States through control and exploitation of
       air and space [syn: United States Air Force, U. S. Air
       Force, US Air Force, Air Force, USAF]

Moby Thesaurus II by Grady Ward, 1.0:

52 Moby Thesaurus words for "air force":
   ANAC, ARF, ATC, ATS, Air Command, Air Transport Command,
   Air Transport Service, Airborne Reconnaissance Force,
   Army-Navy Air Corps, Bomber Command, CASU, Coastal Command, FEAF,
   Fleet Air Arm, MATS, NAD, NATS, Naval Air Division, Navy Air, RAAF,
   RAF, RCAF, Royal Air Force, SAC, Strategic Air Command,
   US Air Force, USAAF, USAF, USNAS, ace, air arm, air armada,
   air corps, air service, bandit, bogey, bomber pilot, combat pilot,
   combat plane, enemy aircraft, escadrille, fighter pilot, flight,
   flyboy, military pilot, naval pilot, observer, squadron,
   strategic air force, suicide pilot, tactical air force, wing