OTD…June 17 and STS-51G

#OTD in 1993…Endeavour launched a new NASA Tracking and Data Relay Satellite.

#OTD in 1994…Columbia launched on a Spacelab microgravity flight

The final manned Mercury mission was launched atop an Atlas rocket on this day in 1963 with Gordon Cooper aboard Faith 7 for a 34-hour, 22-orbit flight.