OTD…June 3, 1965 and the first American walk in space

#OTD in 1998…The launch of Discovery on final shuttle-Mir docking mission

Astronauts Randy Bresnik and Mark Vande Hei headed outside the International Space Station Thursday on a spacewalk to replace one end of the lab’s Canadian-built robotic arm, a changeout that engineers say will restore the device to full capability.

#OTD in 2001…Discovery launched on an International Space Station crew exchange mission