US Air Force
History of the United States Air Force

The Army created the first antecedent of the USAF in 1907, which through a succession of changes of organization, titles, and missions advanced toward eventual separation 40 years later. The USAF became a separate military service on 18 September 1947, with the implementation of the National Security Act of 1947. The Act created the United States Department of Defense, which was composed of three subordinate departments, namely the Department of the Army, the Department of the Navy and a newly-created Department of the Air Force. Prior to 1947, the responsibility for military aviation was shared between the Army (for land-based operations), the Navy (for sea-based operations from aircraft carriers and amphibious aircraft), and the Marine Corps (for close air support of infantry operations).

The United States Air Force (USAF) is the aerial warfare, space warfare, and cyberwarfare branch of the U.S. armed forces and one of the American uniformed services. Initially part of the United States Army, the USAF was formed as a separate branch of the military on 18 September 1947 under the National Security Act of 1947. It is the most recent branch of the U.S. military to be formed. In its 2009 Posture Statement the USAF articulates its primary goals as "Global Vigilance, Global Reach, and Global Power".

As of 2009[update] the USAF operates 5,573 manned aircraft in service (3,990 USAF; 1,213 Air National Guard; and 370 Air Force Reserve); approximately 180 unmanned combat air vehicles, 2,130 air-launched cruise missiles, and 450 intercontinental ballistic missiles. The USAF has 327,452 personnel on active duty, 115,299 in the Selected and Individual Ready Reserves, and 106,700 in the Air National Guard as of September 2008. In addition, the USAF employs 171,313 civilian personnel,[6] and has 57,000 auxiliary members in the Civil Air Patrol.

The Department of the Air Force is headed by the civilian Secretary of the Air Force who oversees all administrative and policy affairs. The Department of the Air Force is a division of the Department of Defense, headed by the Secretary of Defense. The highest ranking military officer in the Department of the Air Force is the Chief of Staff of the Air Force.

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