| Originated | Late 1940s |
| Project name | Sovereign Surveillance Project (SSP) |
| Current users | Militaries and governments worldwide |
| Design features | Metallic circular craft • Dome with surveillance equipment • Three landing pods |
| Original purpose | Surveillance and espionage |
| Country of origin | |
| Crash explanation | Downed SSP prototype |
| Public perception | Roswell crash (1947) |
| Spread of technology | Defected pilots, reverse engineering |
