<P> The agency uses Motorola XTS and APX radios and surveillance kits in order to maintain communications . These radios are known to use DES encryption keys . When operationally required, members of the Special Operations Division use military grade radios that use Type 1 encryption algorithms . </P> <P> When transporting the President in a motorcade, the Secret Service uses a fleet of custom - built armored Cadillac Parade Limousines, the newest and largest version of which is known as "The Beast". Armored Chevrolet Suburbans are also used when logistics require such a vehicle or when a more low profile appearance is required . For official movement the limousine is affixed with U.S. and presidential flags and the presidential seal on the rear doors . For unofficial events the vehicles are left sterile and unadorned . </P> <P> Special Agents and Special Officers of the Secret Service wear attire that is appropriate for their surroundings, in order to blend in as much as possible . In most circumstances, the attire of a close protection shift is a conservative suit, but it can range from a tuxedo to casual clothing as required by the environment . Stereotypically Secret Service agents are often portrayed wearing reflective sunglasses and a communication earpiece . Often their attire is customized to conceal the wide array of equipment worn in service . Agents wear a distinctive lapel pin that identifies them to other agents . </P> <P> The attire for Uniformed Division Officers includes standard police uniforms or utility uniforms and ballistic / identification vests for members of the countersniper team, Emergency Response Team (ERT), and canine officers . The shoulder patch of the Uniformed Division consists of the U.S. coat of arms on white or black, depending on the garment . Also, the shoulder patch is embroidered with "U.S. Secret Service Uniformed Division Police" around the emblem . </P>

Who is the secret service required to protect