USA-299, also referred to as USSF-7 and Orbital Test Vehicle 6 (OTV-6), is the third flight of the first Boeing X-37B, an American unmanned vertical-takeoff, horizontal-landing spaceplane.

The spaceplane is operated by the Department of the Air Force Rapid Capabilities Office[2] and United States Space Force, which considers the mission classified and as such has not revealed the objectives.

[4] This flight is the first time the space plane has been equipped with a service module to carry additional pieces for experiments.

[6] A rideshare payload for the United States Air Force Academy, FalconSat-8, was deployed from the X-37B a few days into the mission.

The satellite provides a platform for the academy's Cadet Space Operations Squadron to test various technologies.