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Air Sac , air sac BROWNING, ORVILLE HICKMAN , Air Force, U.S. OverviewPredecessors of, 1907–46Since 1947
Air Force, U.S.: Overview The U.S. Air Force, the world's most powerful air arm, was not a… United States Air Operations , World War II, U.S. Air Operations in: The Air War in Europe. U.S. air operations in the Mediterranean and Europe evolved into two distinct fields of… Vocalization , Many animals communicate with acoustic signals. Crickets rub a hind leg along a row of protruding spikes; rattlesnakes shake a set of beads in their… Henry Harley Arnold , Henry Harley Arnold
Henry Harley Arnold (1886-1950) was one of America's first military aviators. He became chief of staff of the Army Air Forces in… Anthony Fokker , Air Warfare
Air Warfare. Despite having given birth to the airplane in 1903, the United States was slow to explore the military applications of aviat…
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