Pima Air and Space Museum. Current Markings: 93rd Transportation Company, South Vietnam, 1962. The H-21 was the fourth tandem rotor helicopter design to come from Piasecki.
to the USAF in 1957, to European Aera in 1960, served by the 526th, 32th, 496th and 525th FIS , later Idaho ANG, to MASDC in 1975 as Inventory No. FJ381