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American NASA astronaut Guion Bluford, American NASA astronaut David M Walker (1944-2001), American NASA astronaut Robert D Cabana, American NASA astronaut James S Voss, and American NASA astronaut Michael R Clifford pose, wearing launch and entry suits (LES), for official crew portrait in front of a display and space shuttle orbiter model at the Johnson Space Center (JSC) in Houston, Texas, September 1992. The primary payload of Space Shuttle Discovery mission STS-53 (2nd December to 9th December 1992) is the DoD-1 satellite (formally known as USA-89 NSSDC ID 1992-086B), which was the shuttle's last major payload for the United States Department of Defense. (Photo by Jack Jacob/Space Frontiers/Archive Photos/Hulton Archive/Getty Images)