Orbital Test Vehicle 7 (OTV-7), also referred to as United States Space Force-52 (USSF-52) or USA-349,[3][4] is the fourth flight of the second Boeing X-37B, an American unmanned vertical-takeoff, horizontal-landing spaceplane.

The spaceplane was sent to orbit with a wide range of test and experimentation objectives.

These tests include operating in new orbital regimes, experimenting with space domain awareness technologies and investigating the radiation effects to materials provided by NASA.

[15] A month before launch, the Air Force announced that the mission would fly an X-37B spaceplane.

[6][16] In Oct 2024, OTV-7 was due to undertake aerobraking maneuvers to safely dispose of its service module.