| Name of Satellite, Alternate Names | Angels (Automated Navigation and Guidance Experiment for Local Space, USA 255) |
| Country of Operator/Owner | USA |
| Operator/Owner | Air Force Research Laboratory (AFRL) |
| Users | Military |
| Purpose | Technology Development |
| Class of Orbit | GEO |
| Type of Orbit | |
| Longitude of GEO (degrees) | |
| Perigee (km) | 35900 |
| Apogee (km) | 35900 |
| Eccentricity | 0 |
| Inclination (degrees) | |
| Period (minutes) | |
| Launch Mass (kg.) | 70 |
| Dry Mass (kg.) | |
| Power (watts) | |
| Date of Launch | 28-07-2014 |
| Expected Lifetime | 1 yr. |
| Contractor | Orbital Sciences Corp. |
| Country of Contractor | USA |
| Launch Site | Cape Canaveral |
| Launch Vehicle | Delta 4M |
| COSPAR Number | 2014-043C |
| NORAD Number | 40101 |
| Comments | Equipped with instrumentation to detect, track and identify other spacecraft in orbit. |