ModelC/N US Army variant. Conversions to H-34C. Redesignated CH-34A in 1962. Many transferred to South Vietnam Air Force and Thailand. List of Operators of H-34A Choctaw Years Model Org 1955/71 S-58 H-34 US Marine Corps 1955/70 S-58 H-34 US Army Aviation 1956/76 S-58 H-34 Armée de l'Air 1958/69 S-58 H-34 Heil Ha'Avir 1962/75 S-58 H-34 Không lực Việt Nam Cộng hòa 1962/03 S-58 H-34 Royal Thai Air Force 1965/?? S-58 H-34 Lao People's Armed Forces 1971/92 S-58 H-34 Aviacion Naval Uruguaya 1971/74 S-58 H-34 US Air Force S-58 H-34 S-58 H-34 Okanagan Helicopters S-58 H-34 State of California Global Distribution of H-34A Choctaw 552h-34a