Launch data:
| Designation | 21775 / 91076A |
| Launch date | 08 Nov 1991 |
| Launch site | Va, SLC-4E |
| Launch vehicle | Titan-4(03)A |
| Mission | Military: Communications |
| Elliptical Earth orbit: | |
| Perigee / Apogee | 1200 x 11600 km |
| Eccentricity | 4.07E-01 |
| Inclination | 63.4 deg |
| Period | 240 min |
SLDCOM under construction by NRL