Boeing X-37

family of American uncrewed military air and space vehicles

USA-212 was the first flight of the Boeing X-37B Orbital Test Vehicle 1 (X-37B OTV-1), an American robotic vertical-takeoff, horizontal-landing (VTHL) spaceplane. It was launched aboard an Atlas V rocket from Cape Canaveral on 22 April 2010, and operated in low Earth orbit. Its designation is part of the USA series.

OTV-2 (also known as USA-226) was the first flight of the second Boeing X-37B, an American unmanned robotic vertical-takeoff, horizontal-landing spaceplane. It was launched aboard an Atlas V rocket from Cape Canaveral on 5 March 2011, and landed at Vandenberg Air Force Base on 16 June 2012. It operated in low Earth orbit. Its USA-226 mission designation is part of the USA series.

USA-277, also referred to as Orbital Test Vehicle 5 (OTV-5), is the third flight of the second Boeing X-37B, an American unmanned vertical-takeoff, horizontal-landing spaceplane. It was launched to low Earth orbit aboard a Falcon 9 rocket from LC-39A on September 7, 2017. Its mission designation is part of the USA series.

thumb|An X-37B onboard camera captures an image of Earth Orbital Test Vehicle 7 (OTV-7), also referred to as United States Space Force-52 (USSF-52) or USA-349, is the fourth flight of the second Boeing X-37B, an American unmanned vertical-takeoff, horizontal-landing spaceplane. It was launched to a highly elliptical high Earth orbit aboard a Falcon Heavy rocket (for the first time) from LC-39A on 29 December 2023 at 01:07:00 UTC (December 28, 8:07 pm EST, local time at the launch site).