The US Marine Corps contracted Sikorsky for four YCH-53A (S-65A) prototypes. Due to budget cuts and by mutual agreement, Sikorsky built only two prototypes and used them extensively for testing. First flight of prototype was 14 October 1964. 
List of Operators of YCH-53A |
| Years | Model | Org | |
|---|---|---|---|
| 1966/12 | S-65 H-53 |  US Marine Corps |
Global Distribution of YCH-53A |
|
Construction Numbers |
| C/N | Year | History | ||
|---|---|---|---|---|
| 65-001 scrapped 1967 | 1964 | 151613 | ||
| 65-002 scrapped 1965 | 1964 | 151614,N6983R | ||
