Topic summary
USA-261
Extracted from the Wikipedia article OTV-4.
USA-261, also referred to as Orbital Test Vehicle 4 (OTV-4) or AFSPC-5, is the second flight of the second BoeingX-37B, an American unmanned vertical-takeoff, horizontal-landingspaceplane. It was launched to low Earth orbit aboard an Atlas V rocket from Cape Canaveral on May 20, 2015. Its mission designation is part of the USA series.