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The sign by the display. It read:

Pete Conrad (above) and Gordon Cooper created the first space crew patch. Pete took this patch (left) with him aboard the Gemini V spacecraft for its record 8-day journey.

The crew designed the patch with the "8 days or bust" slogan, but NASA brass objected to this, fearing that the press would have a field day if the mission lasted less than 8 days. A compromise was reached whereby the crew covered the slogan with a piece of cloth. After the mission was completed, they removed the cloth to expose the slogan. Additional information on this matter may be found here.