ModelC/N Improved commercial version with 800HP Wright R-1300-3 cyclone engine. List of Operators of Sikorsky S-55C From Organisation with model S-55C 1954 Bharatiya Vayu Sena S-55 H-19 1954/?? 1955 Japan Ground Self-Defense Force S-55 H-19 17 1955/?? 1956 Suid-Afrikaanse Lugmag S-55 H-19 4 1956/68 1957 Fuerza Aerea de Chile S-55 H-19 8 1957/90 Flyvevåbnet S-55 H-19 7 1957/66 Fuerza Aerea Dominicana S-55 H-19 3 1957/69 Japan Air Self-Defense Force S-55 H-19 4 1957/?? 1958 Royal Canadian Air Force (1945-1968) S-55 H-19 14 1958/66 1964 Força Aeronaval da Marinha do Brasil 1964 1968 Autair Helicopters 3 1968/72 Construction Numbers on database of S-55C 64S-55C