The United Launch Alliance (ULA) successfully launched the SBIRS GEO-5, TDO 3 and TDO 4 satellites into a GTO orbit at 1737 GMT on 18 May on an Atlas V 421 vehicle from Cape Canaveral Space Force Station, Florida, USA. The primary payload SBIRS GEO 5 is a part of the military Space Based infrared System programme. These satellites provide a missile launch detection service enabling early warning activities. Also on-board were the TDO-3 and -4 CubeSats which are technology demonstration satellites for the US Air Force Academy.
Phil Hylands contributed to this article.