Canceled Space Shuttle mission
STS-62-A was a planned NASA Space Shuttle mission to deliver a reconnaissance payload (Teal Ruby) into polar orbit. It was expected to use "Discovery". It would have been the first crewed launch from Vandenberg Air Force Base in California, and the first crewed mission to go into polar orbit. 
The mission designation, STS-62-A, meant: 6=fiscal year 1986, 2=Vandenberg (1=Kennedy Space Center), and A=first flight in that fiscal year.
Post-"Challenger" accident.
The destruction of "Challenger" and subsequent halt of the Space Shuttle program led to the cancellation of the mission.
Guy Gardner, Jerry Ross, and Mike Mullane were members of the second post-"Challenger" mission STS-27 — a classified mission for the DoD — during which the Lacrosse-1 radar reconnaissance spacecraft was allegedly deployed.
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