STS-53 crew
Back row (L-R): David Walker, Robert Cabana, Michael Clifford
Front row (L-R): Guion Bluford, James Voss
STS-53 mission patch
Space Shuttle Discovery (STS-53) launched December 2, 1992, carrying a classified payload for the Department of Defense. Its crew consisted of Commander David Walker, Robert Cabana, Guion Bluford (final flight), Michael Clifford (first flight), and James Voss.
One of the unclassified payload was the Orbital Debris Radar Calibration Spheres (ODERACS), which put objects of known size and shape into orbit. The experiment was used to calibrate radars and telescopes for measuring orbital debris.
The crew returned to Earth December 9.
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