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Top Secret: US sends unmanned autonomous drone into deep space on powerful SpaceX rocket
What is the X-37B, the US military’s top secret spacecraft?
Mysterious US spacecraft returns after 908 days, speculation grows over secret mission
China quietly tests launch, recovery of reusable spacecraft tech in secretive two-day test flight
US Air Force's X-37B space plane completes two-year secret mission
The just-ended mission, known as OTV-4, was launched in May 2015 and conducted secret experiments for a total of 718 days while in orbit.
