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USA 344, 399, 546, 547, 548, 551, 552, 553

USA 344, 399, 546 , 547 and 548 are unidentified experimental satellites. Likely they are different kinds of satellite, but are listed here collectively due to lack of further information.

These satellites were launched in 2022 as a deployable payload on the LDPE 2 satellite on the USSF 44 mission on a Falcon-Heavy (Block 5)(px) rocket. Likely these are different designs.

USA 344 was deployed in January 2023.

USA 399 was deployed in August 2024.

Another satellite, USA 546, was deployed in early June 2025.

Two more satellites, USA 547 and USA 548, were deployed in mid June 2025.

three more satellites, USA 551, USA 552 and USA 553, had appeared by August 2025.

Nation: USA
Type / Application: Technology
Operator: AFRL ?
Contractors: AFRL ?
Equipment:
Configuration:
Propulsion:
Power: Deployable solar array, batteries
Lifetime:
Mass:
Orbit:
Satellite COSPAR Date LS Launch Vehicle Remarks
USA 344 2022-144J 01.11.2022 CCK LC-39A Falcon-Heavy (Block 5)(px) with Shepherd Demonstration (USA 339, USSF 44), LDPE 2, Tetra 1, Alpine, LINUSS 1, 2, USA 344, USA 399, USA 546, USA 547, USA 548, USA 551, USA 552, USA 553, USA 556, USA 557
USA 399 2022-144K 01.11.2022 CCK LC-39A Falcon-Heavy (Block 5)(px) with Shepherd Demonstration (USA 339, USSF 44), LDPE 2, Tetra 1, Alpine, LINUSS 1, 2, USA 344, USA 399, USA 546, USA 547, USA 548, USA 551, USA 552, USA 553, USA 556, USA 557
USA 546 2022-144L 01.11.2022 CCK LC-39A Falcon-Heavy (Block 5)(px) with Shepherd Demonstration (USA 339, USSF 44), LDPE 2, Tetra 1, Alpine, LINUSS 1, 2, USA 344, USA 399, USA 546, USA 547, USA 548, USA 551, USA 552, USA 553, USA 556, USA 557
USA 547 2022-144M 01.11.2022 CCK LC-39A Falcon-Heavy (Block 5)(px) with Shepherd Demonstration (USA 339, USSF 44), LDPE 2, Tetra 1, Alpine, LINUSS 1, 2, USA 344, USA 399, USA 546, USA 547, USA 548, USA 551, USA 552, USA 553, USA 556, USA 557
USA 548 2022-144N 01.11.2022 CCK LC-39A Falcon-Heavy (Block 5)(px) with Shepherd Demonstration (USA 339, USSF 44), LDPE 2, Tetra 1, Alpine, LINUSS 1, 2, USA 344, USA 399, USA 546, USA 547, USA 548, USA 551, USA 552, USA 553, USA 556, USA 557
USA 551 2022-144P 01.11.2022 CCK LC-39A Falcon-Heavy (Block 5)(px) with Shepherd Demonstration (USA 339, USSF 44), LDPE 2, Tetra 1, Alpine, LINUSS 1, 2, USA 344, USA 399, USA 546, USA 547, USA 548, USA 551, USA 552, USA 553, USA 556, USA 557
USA 552 2022-144Q 01.11.2022 CCK LC-39A Falcon-Heavy (Block 5)(px) with Shepherd Demonstration (USA 339, USSF 44), LDPE 2, Tetra 1, Alpine, LINUSS 1, 2, USA 344, USA 399, USA 546, USA 547, USA 548, USA 551, USA 552, USA 553, USA 556, USA 557
USA 553 2022-144R 01.11.2022 CCK LC-39A Falcon-Heavy (Block 5)(px) with Shepherd Demonstration (USA 339, USSF 44), LDPE 2, Tetra 1, Alpine, LINUSS 1, 2, USA 344, USA 399, USA 546, USA 547, USA 548, USA 551, USA 552, USA 553, USA 556, USA 557
USA 556 2022-144S 01.11.2022 CCK LC-39A Falcon-Heavy (Block 5)(px) with Shepherd Demonstration (USA 339, USSF 44), LDPE 2, Tetra 1, Alpine, LINUSS 1, 2, USA 344, USA 399, USA 546, USA 547, USA 548, USA 551, USA 552, USA 553, USA 556, USA 557
USA 557 2022-144T 01.11.2022 CCK LC-39A Falcon-Heavy (Block 5)(px) with Shepherd Demonstration (USA 339, USSF 44), LDPE 2, Tetra 1, Alpine, LINUSS 1, 2, USA 344, USA 399, USA 546, USA 547, USA 548, USA 551, USA 552, USA 553, USA 556, USA 557

Launch Sites:

  • CCK =   NASA John F. Kennedy Space Center, Cape Canaveral, Florida, USA   USA
Further STP missions:

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Last update: 20.09.2025
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