Twenty-First Air Force

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Twenty-First Air Force was a Numbered Air Force in U.S. Air Force. In its most recent form, it was Air Mobility Command's intermediate echelon for units in the eastern United States, Atlantic, European, and Middle East theaters. On October 1st, 2003, Twenty-First Air Force was redesignated Twenty-First Expeditionary Mobility Task Force (EMTF), a new organization below a Numbered Air Force.

Created as a wing of the USAAF during World War II, it gradually evolved into its modern designation of Twenty-First Air Force. Initially, it ferried aircraft, but by 1942, its mission had changed, as it is today, to airlifting personnel and cargo.