STS-51D - A-B Emblem

STS-51-D was the sixteenth flight of NASA's Space Shuttle program, and the fourth flight of Space Shuttle Discovery.[1] The launch of STS-51-D from Kennedy Space Center (KSC), Florida, on 12 April 1985 was delayed by 55 minutes, after a boat strayed into the restricted Solid Rocket Booster (SRB) recovery zone. STS-51-D was the third shuttle mission to be extended.

Below are two versions of the A-B Emblem STS-51D patch. The mid-blue and light blue versions. The mid-blue is more difficult to find.  There is also an AB Emblem example were the main body of the patch is an original STS-41F patch, but with a mid blue 'tab' sewn onto the bottom to make the whole patch a STS-51D. 

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AB Emblem also manufactured variants to the colours of the blue / light blue twill backing they used on this patch, (the same as they did with the STS-51E patches). So versions of this STS-51D patch exist with light blue main body with a mid blue 'tab' attached, a mid blue main body & mid blue 'tab' attached, & a mid blue main body with a light blue 'tab' attached. (The one shown above is the common light blue main body with a light blue 'tab' attached). Also this patch is known with a STS-41F main body but with the light blue twill coloured 'tab' attached to make it a STS-51D patch.