OTD…Jan. 28 and STS-51L

#OTD…Gamma Ray Observatory launched in 1991 on Atlantis and Discovery’s 2010 ISS flight

#OTD in 1985…Discovery launched on the first classified space shuttle mission for the Department of Defense. Watch the liftoff:

#OTD…Launch of Columbia in 1998 on the Neurolab Spacelab mission