| Name of Satellite, Alternate Names | UFO-4 (USA 108, UFO F4 EHF) "UHF Follow-On" |
| Country of Operator/Owner | USA |
| Operator/Owner | US Navy |
| Users | Military |
| Purpose | Communications |
| Class of Orbit | GEO |
| Type of Orbit | |
| Longitude of GEO (degrees) | -177.12 |
| Perigee (km) | 35763 |
| Apogee (km) | 35775 |
| Eccentricity | 0.000142385913286979 |
| Inclination (degrees) | 3.34 |
| Period (minutes) | 1435.22 |
| Launch Mass (kg.) | 3200 |
| Dry Mass (kg.) | 1545 |
| Power (watts) | 2,800 (EOL) |
| Date of Launch | 29-01-1995 |
| Expected Lifetime | 4 yrs. |
| Contractor | Boeing Satellite Systems |
| Country of Contractor | USA |
| Launch Site | Cape Canaveral |
| Launch Vehicle | Atlas 2 |
| COSPAR Number | 1995-003A |
| NORAD Number | 23467 |
| Comments | Ultra-High Frequency (UHF) communications and Super-High Frequency (SHF) antijam command and broadcast capabilities through four pairs of geosynchronous satellites and one spare; tactical application. |