The United States Air Force (USAF) is the aerial warfare service branch of the United States Armed Forces and one of the seven 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 ...
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http://en.wikipedia.org/wiki/United_States_Air_Force
U. S. Air Force noun the airforce of the United States of America; the agency that defends the United States through control and exploitation of air and space
Found on
https://www.encyclo.co.uk/local/20974
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. Abbr.: USAF
Found on
https://www.infoplease.com/dictionary/united-states-air-force
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