USSF-259 is a classified mission for the United States Space Force. It is possibly a batch of classified LEO satellites based on SpaceX’s Starshield satellite bus, based on locations of ascent rocket stage drop zones being fits with previous SDA Transport Layer launches.

| Full name | Falcon 9 Block 5 |
| Family | Falcon |
| Name | Falcon 9 |
| Variant | Block 5 |
| Length | 70 m |
| Maiden flight | 2018 |
| Name | SpaceX |
| Country | USA |
| Founded | 2002 |