A secret space plane that has been years in the making is now set to launch into the final frontier. The United States Air Force plans to launch the X-37B or...
Secret Missions of the X-37B
Launch of X-37B Mini Space Shuttle on OTV-3 Mission
X-37 ALTV Test Flight (2010)
Secret X-37B Spaceplane's Mystery Mission!
X-37B: Secret space plane
X-37B SHUTTLE DISAPPEARS!