5th Reconnaissance Squadron
Following World War II, the National Security Act of 1947 established the U.S. Air Force as a sister service of the Army and Navy. The concurrent establishment of major commands within the Air Force brought wholesale realignments, including creating new wings with subordinate groups and squadrons. The Air Force established the 9th Strategic Reconnaissance Wing on 25 April 1949 and activated it on 1 May. The Air Force also activated and redesignated the 9th Bomb Group and its subordinate squadrons, making them the 9th Reconnaissance Group, and the 1st, 5th and 99th Reconnaissance Squadrons. The 5th Reconnaissance Squadron's new home was Fairfield-Suisan (later Travis) AFB, California. For the next 11 months, squadron crewmembers flew RB-29s on visual, photographic, electronic, and weather reconnaissance missions.
Air force infantry and special forces
First formed during World War II, the United States Air Force Security Police were dramatically reduced in scope following the war. Post war the newly established United States Air Force (USAF) saw its primary role as a strategic one. Its base defense doctrine thus was one of security policing. United States involvement in Vietnam, however, brought a real and sustained threat of ground attack. To meet these threats the Phu Cat Air Base Security Forces pioneered the Air Base Ground Defense doctrine that informs USAF practice to this day.