The tenth mission for Challenger, STS-51-L was scheduled to deploy the second in a series of Tracking and Data Relay Satellites, carry out the first flight of the Shuttle-Pointed Tool for Astronomy (SPARTAN-203)/Halley's Comet Experiment Deployable in order to observe Halley's Comet, and carry out several lessons from space as part of the Teacher in Space Project and Shuttle Student Involvement Program (SSIP). The flight marked the first American orbital mission to involve in-flight fatalities. It was also the first American human spaceflight mission to launch and fail to reach space; the first such mission in the world had been the Soviet Soyuz 18a mission, in which the two crew members had survived. Gregory Jarvis was originally scheduled to fly on the previous shuttle flight (STS-61-C), but was re-assigned to this flight and replaced by Congressman Bill Nelson
This patch almost appears as a hybrid of the original A-B Emblem version and the Swissartex patch. It has a sew-on tab like A-B Emblem, however the Challenger's yellow trail resembles Swissartex's version. It lacks the gray underline below the yellow swoop that would make it an older A-B Emblem patch as well.
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