The U.S. Air Force is one of six branches of the United States Armed Forces. The U.S. Air Force operates under the Department of the Air Force which is one of three military departments under the Department of Defense. Although the U.S. Air Force is the second youngest branch, it has operated, under different names, alongside the U.S. Army since 1907. Today, the U.S. Air Force operates as the largest air force in the world.
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