The space agency uploaded — and will continue to upload — rare and previously unreleased footage from test aircraft flights of past decades. According to Gizmodo, NASA’s Armstrong Flight Research Center has released roughly 300 of the 500 planned video clips to its YouTube channel.

The footage includes everything from historic 1960s-era lunar landing craft and testing of plane-launched aircraft like the X-15A-2 to the more modern, unmanned Boeing X-45A.