OTD…July 23 and STS-93

#OTD in 1997…Columbia launched on the reflight of her shortened Microgravity Science Laboratory mission

#OTD…America’s first shuttle launch in 1981 and another in 1985

#OTD in 1982…Columbia launches on the fourth space shuttle mission. #OTD in 1995…Atlantis launches on first shuttle-Mir docking flight