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R-4:  Sikorsky R-4 display, National Museum of the Air Force. (U.S. Air Force Photo)


Helicopters in the U.S. Air Force

R-4: Sikorsky R-4 display, National Museum of the Air Force. (U.S. Air Force Photo)

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U.S. Air Force photo
170525-F-XX001-0002.JPG

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