Since 2009, the United States Presidential State Car has become labeled "Cadillac One"; as a result of its massive size, it is also nicknamed "The Beast". Corresponding to its use by the Secret Service, many details about the vehicle remain classified. While its chassis specifications were never revealed by Cadillac or the Secret Service, the vehicle was developed alongside GMC TopKicks on the GMC560 platform. In place of previous limousines, the highly armored vehicle is not based upon a production Cadillac model line, instead wearing a one-of-a-kind body (borrowing components from Cadillac vehicles).