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The last flight of MH-53 Pave Low, helicopter for USAF special force missions
Rome, Italy - On September 27th, 2008
In 1959, the US Marine Corps began to seek a replacement for their old S-56 piston-powered helicopters, originally working with the other three U.S. armed services on the "Tri-Service VTOL transport", which would eventually emerge as the Vought-Hiller-Ryan XC-142A tilt-wing. The design became more elaborate and the program stretched out resulting in Marines deciding they couldn't get a workable machine...
AVIONEWS - World Aeronautical Press Agency