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| X-23A PRIME | |
|---|---|
 Preserved X-23A PRIME at USAF Museum, Dayton, Ohio | |
| General information | |
| Type | Lifting body |
| National origin | United States |
| Manufacturer | Martin Marietta |
| Status | Out of service |
| Primary user | United States Air Force |
| Number built | 3 |
| History | |
| First flight | 21 December 1966 |
| Retired | 19 April 1967 |
| Variants | Martin Marietta X-24 |
The Martin X-23A PRIME (Precision Reentry Including Maneuvering reEntry) (SV-5D) is a small lifting-body re-entry vehicle tested by the United States Air Force in the mid-1960s. Unlike ASSET, primarily used for structural and heating research, the X-23A PRIME was developed to study the effects of maneuvering during re-entry of Earth's atmosphere, including cross-range maneuvers up to 617 nmi (710 mi; 1,143 km) from the ballistic track.