Located at the Kennedy Space Center (KSC) and operated by the KSC Fire Department, for every crewed spacecraft launch during Mercury, Gemini and Apollo programs two vehicles containing firefighters and emergency rescue personnel wearing fire-proof suits were located approximately one mile from the foot of the launchpad. For the Space Shuttle program a further unmanned vehicle was parked outside the exit of the crew evacuation bunker for use by the spacecraft crew as an emergency evacuation vehicle. As part of their mission training, the Shuttle astronauts were taught to drive and operate the vehicles (usually units 3 and 4), and each crew would affix their respective mission patch upon the vehicle's exterior.