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With rare exceptions, rockets are expendable, so rockets in displays have not been flown. As in the case of the Saturn V, later planned missions were cancelled, leaving unneeded rockets for the museums. For displays of early American space hardware, such as Project Mercury and Project Gemini, surplus missiles have been painted to look like manned space launch vehicles. Engineering test articles (such as the Pathfinder space shuttle stack in Huntsville) or purpose-built full-scale replicas are also displayed in rocket gardens.