SpaceX Falcon Heavy launches X-37B plane, one of the US military’s most fascinating secrets

, into orbit Yes, on April 9, 2020 the SpaceX Falcon Heavy launched into orbit the X-37B, an orbital test vehicle used by the United States Air Force. This was part of the fifth mission of the vehicle, which was funded by the U.S. military for unknown purposes, making it one of the most mysterious military projects.