A Sikorsky CH-54 Tarhe 'Skycrane' heavy-lift helicopter runs up its rotors on an airfield ramp in South Vietnam, with a Boeing CH-47 Chinook parked nearby and a U.S. Army jeep in the foreground. The Skycrane's distinctive open-frame fuselage allowed it to carry oversized cargo pods, bulldozers, artillery pieces, and even downed aircraft slung beneath its belly, making it one of the most versatile heavy-lift assets of the Vietnam War's extensive helicopter-borne logistics network. Project: 218406