Sikorsky CH-34C 56-4284 United States ArmyThese are 1 72 scale decals for the Sikorsky CH 34C Choctaw, serial 56 4284, assigned to the 56th Aviation Company, United States Army one of the Army's workhorse transport helicopters of the late 1950s and early Vietnam era. The CH 34 Choctaw was the U. S. Army's designation for the Sikorsky S 58, a large piston powered transport helicopter that represented a significant step forward in rotary wing capability when it entered service in the mid 1950s.