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 |
| C/N | Year | History | |
|---|---|---|---|
| 55-017 | 1951 | 127783,N4781S | |
| 55-018 w/o 1952 | 1951 | 127784 | |
| 55-019 | 1951 | 127785 | |
| 55-020 | 1951 | 127786,N4779S,N9013R,XB-WAV | |
| 55-021 | 1951 | 127787,N4780S | |
| 55-022 w/o 1953 | 1951 | 127788 | |
| 55-023 | 1951 |  ,127789,51-17663 | |
| 55-024 | 1951 | 127790,51-17664 | |
| 55-025 w/o 1955 | 1951 | 127791 | |
| 55-026 w/o 1951 | 1951 | 127792 | |
| 55-027 | 1951 | 127793,N4597CJ,N49557S | |
| 55-028 | 1951 | 127794 | |
| 55-029 w/o 1952 | 1951 | 127795 | |
| 55-030 w/o 1953 | 1951 | 127796 | |
| 55-031 | 1951 | ,127797,51-17662 | |
| 55-032 | 1951 | 127798 | |
| 55-033 | 1951 | 127799,N2798 | |
| 55-035 | 1951 | 127800 | |
| 55-036 w/o 1953 | 1951 | 127801 | |
| 55-037 w/o 1951 | 1951 | 127802 | |
| 55-038 w/o 1952 | 1951 | 127803 | |
| 55-039 | 1951 | 127804 | |
| 55-040 | 1951 | 127805,CF-MOT | |
| 55-041 | 1951 | 127806 | |
| 55-042 w/o 1953 | 1951 | 127807 | |
| 55-043 | 1951 | | |
| 55-044 w/o 1953 | 1951 | 127808 | |
| 55-045 | 1951 | 127809 | |
| 55-046 w/o 1954 | 1951 | 127810 | |
| 55-047 | 1951 | 127811 | |
| 55-048 | 1951 | 127812 | |
| 55-049 w/o 1955 | 1951 | 127813 | |
| 55-050 | 1951 | 127814 | |
| 55-051 | 1951 | 127815 | |
| 55-052 | 1951 | 127816 | |
| 55-053 | 1951 | 127817 | |
| 55-054 | 1951 | 127818,51-17665 | |
| 55-055 | 1951 | 127819 | |
| 55-056 scrapped 1969 | 1951 | 127820,3007 | |
| 55-057 | 1951 | 127821 | |
| 55-058 w/o 1953 | 1951 | 127822 | |
| 55-059 w/o 1967 | 1951 | 127823,N6872C | |
| 55-060 w/o 1952 | 1951 | 127824 | |
| 55-061 scrapped 1973 | 1951 | 127825 | |
| 55-062 | 1951 | 127826 | |
| 55-063 | 1951 | 127827 | |
| 55-066 | 1951 | 127828 | |
| 55-067 w/o 1951 | 1951 | 127829 | |
| 55-068 | 1951 | 127830,N90009,N9009R | |
| 55-069 | 1951 | 127831,N74125,N74125J | |
| 55-070 | 1951 | 127832,51-17666 | |
| 55-071 | 1951 | 127833 | |
| 55-072 | 1951 | 127834 | |
| 55-073 | 1951 | 127835 | |
| 55-074 | 1951 | 127836 | |
| 55-077 | 1951 | 127837 | |
| 55-078 | 1951 | 127838 | |
| 55-079 | 1951 | 127839,N90010,N9010R,XB-WOJ | |
| 55-080 | 1951 | 127840 | |
| 55-081 w/o 1956 | 1951 | 127841 | |
| 55-082 | 1952 | 127842 |
