Insignia
This was the first mission to have an insignia patch. After Gemini 3, NASA barred astronauts from naming their spacecraft. Cooper, having realized he had never been in a military organization without one, suggested a mission patch to symbolize the flight. NASA agreed, and the patches got the generic name of "Cooper patch." Cooper choose the image of a covered wagon due to the pioneering nature of the flight. The slogan "8 Days or Bust" was emblazoned across the wagon, but NASA managers objected to this, feeling it placed too much emphasis on the mission length and not the experiments, and fearing the public might see the mission as a failure if it did not last the full duration. A piece of nylon cloth was sewn over the slogan.
Read more about this topic: Gemini 5