| Name of Satellite, Alternate Names | Improved Trumpet 4 (NROL-22, National Reconnaissance Office Launch-22, SBIRS HEO-1, Twins 1, USA 184) |
| Country of Operator/Owner | USA |
| Operator/Owner | National Reconnaissance Office (NRO) |
| Users | Military |
| Purpose | Electronic Surveillance |
| Class of Orbit | Elliptical |
| Type of Orbit | Molniya |
| Longitude of GEO (degrees) | 0 |
| Perigee (km) | 1111 |
| Apogee (km) | 37564 |
| Eccentricity | 0.708995429349412 |
| Inclination (degrees) | 63 |
| Period (minutes) | 684 |
| Launch Mass (kg.) | 4000 |
| Dry Mass (kg.) | |
| Power (watts) | |
| Date of Launch | 28-06-2006 |
| Expected Lifetime | |
| Contractor | National Reconnaissance Laboratory |
| Country of Contractor | USA |
| Launch Site | Vandenberg AFB |
| Launch Vehicle | Delta 4 |
| COSPAR Number | 2006-027A |
| NORAD Number | 29249 |
| Comments | Speculation on purpose - HEO indicates possible SBIRS-HEO test payload; may also carry NASA´s TWINS-A science payload to map the Earth´s magnetosphere. |