United States Department of Defense - United States Air Force

The United States Air Force (USAF) is the aerial warfare branch of the United States armed forces and one of the seven uniformed services of the U.S.. Previously part of the United States Army, the USAF was formed as a separate branch of the military on September 18, 1947.

The USAF is the largest and most technologically advanced air force in the world, with about 6013 manned aircraft in service (4,282 USAF; 1,321 Air National Guard; and 410 Air Force Reserve); approximately 160 Unmanned Combat Air Vehicles, 2161 Air-Launched Cruise Missiles, and 580 Intercontinental Ballistic Missiles;and as of September 30, 2006, had 334,200 personnel on active duty, 120,369 in the Selected and Individual Ready Reserves, and 107,000 in the Air National Guard. An additional 10,675 personnel were in the Standby Reserve, and the Air Force employed 168,558 civilian personnel.

The USAF is currently planning a massive Reduction-in-Force (RIF). Because of budget constraints, the USAF will reduce the service's current size by 40,000 full time equivalent positions by 2011, with approximately half to be eliminated in FY 2007. Approximately 35,000 active duty positions (ADPs), or one year's cycle of enlistments and retirements, will be eliminated over 5 years. The current size of the active-duty force is roughly 70% of that of the USAF at the end of the first Gulf War in 1991.

Not all of the United States' military combat aircraft are operated by the USAF. The United States Army operates its own helicopters, mostly for support of ground combatants; it as well maintains a small fleet of fixed wing aircraft (mostly Unmanned Aerial Vehicles). The Navy is responsible for the aircraft operating on its aircraft carriers and Naval air stations, and the Marine Corps operates its own combat and transport aircraft. The Coast Guard also maintains transport and search-and-rescue aircraft (SARA), which may be used in a combat and law enforcement role. All branches of the U.S. military operate helicopters.

The Department of the Air Force is headed by the civilian Secretary of the Air Force who heads administrative affairs. The Department of the Air Force is a division of the United States Department of Defense which is headed by the United States Secretary of Defense. The highest ranking military officer in the department is the Chief of Staff of the Air Force.