OTD…July 4 and STS-121

American and Soviet crews were launched today in 1975 for the first handshakes in space between the two superpowers as part of the Apollo-Soyuz Test Project.

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

#OTD…Launch of a 1993 environmental mission on Discovery and Atlantis’ ISS flight in 2002