The SR-71 patch is a 3.5" round, embroidered sew on patch. The patch reads SR-71 Blackbird along the top, with 3+ next to an image of the plane. The 3+ refers to the speed of the Blackbird, Mach 3+ (more than 3 times the speed of sound). The patch also has a skunk, the mascot of the Lockheed Martin's Advanced Development Projects, or Skunk Works, the program that developed the SR-71.
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