Jisho

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Wikipedia definition
1. Army OneArmy One is the callsign of any United States Army aircraft carrying the President of the United States. From 1957 until 1976, this was usually an Army helicopter transporting the President. Prior to 1976, responsibility for helicopter transportation of the President was divided between the Army and the U.S. Marine Corps until the Marine Corps was given the sole responsibility of transporting the President by helicopter.
Read “Army One” on English Wikipedia
Read “アーミーワン” on Japanese Wikipedia
Read “Army One” on DBpedia

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