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STS-51-G was the 18th flight of NASA's Space Shuttle program, and the fifth flight of Space Shuttle Discovery.

STS-51D was the 16th flight of NASA's Space Shuttle program, and the fourth flight of Space Shuttle Discovery.

This was the first mission dedicated to the Department of Defense. The U.S. Air Force Inertial Upper Stage (IUS) booster…

STS-51B was the 17th flight of NASA's Space Shuttle Program, and the seventh flight of Space Shuttle Challenger.

The Gemini program was designed as a bridge between the Mercury and Apollo programs, primarily to test equipment and mission…