The Sikorsky H-34 (CH-34) Choctaw was a piston-engine utility helicopter powered by a nose-mounted Wright R-1820 Cyclone radial engine, seen here exposed beneath an open cowling panel. Widely used by the U.S. Air Force, Navy, Marine Corps, and allied nations from the 1950s through the Vietnam era for transport, rescue, and utility roles, the H-34's engine placement in the nose was a distinctive design feature that kept the cabin clear for cargo and personnel. Project: 218914