USMC version of the HO4S-1 with P&W R-1340-57 Wasp engine for eight troops, 60 built, plus one static airframe used for testing. 
List of Operators of HRS-1 |
| Years | Model | Org | |
|---|---|---|---|
| 1951/67 | S-55 H-19 |  US Air Force | |
| 1951/57 | S-55 H-19 | US Navy | |
| 1951/60 | S-55 H-19 | US Marine Corps | |
| 1953/?? | S-55 H-19 |  Armée de l'Air | |
| 1954/?? | S-55 H-19 |  Royal Thai Air Force | |
| 1957/69 | S-55 H-19 |  Fuerza Aerea Republica Dominicana |
Global Distribution of HRS-1 |
|
Construction Numbers |
Displaying only Không lực Việt Nam Cộng hòa - Display All
| C/N | Year | History | ||
|---|---|---|---|---|
| 55-023 | 1951 |  ,127789,51-17663 | ||
| 55-031 | 1951 | ,127797,51-17662 | ||
