OTD…May 18 and launch of Apollo 10

#OTD in 1985…Challenger suffered an engine shutdown on her way to orbit for a Spacelab mission

#OTD in 1991…Atlantis launched another of NASA’s Tracking and Data Relay Satellites

A commercial Antares rocket rolled out of a hangar on a one-mile trip to its launch pad on Virginia’s Eastern Shore on Thursday, ready for final countdown preparations ahead of liftoff Saturday morning on a cargo delivery flight to the International Space Station.