| Frequency | System | FleetID | User | City | State | Sys_Type | Notes | Additional Notes |
| 406.55 | Sheppard AFB | ** | ** | Sheppard AFB | TX | II | APCO 25 | Digital |
| 407.5 | Sheppard AFB | ** | ** | Sheppard AFB | TX | II | APCO 25 | Digital |
| 407.95 | Sheppard AFB | ** | ** | Sheppard AFB | TX | II | APCO 25 | Digital |
| 408.55 | Sheppard AFB | ** | ** | Sheppard AFB | TX | II | APCO 25 | Digital |
| 409.75 | Sheppard AFB | ** | ** | Sheppard AFB | TX | II | ** | ** |