The United States Secret Service (USSS) or Secret Service is a United States federal law enforcement agency. The USSS has a protective role: ensuring the safety of current and former national leaders and their families, such as the President, past Presidents, Vice Presidents, presidential candidates and foreign embassies.
Secret Service Tactical Teams are first seen alongside Commander David Mason clearing The Vault in the opening cutscene before the first mission "Pyrrhic Victory". They appear in the mission "Cordis Die", assisting friendly forces during the attack in Los Angeles to defend the US president. Three SSA are trapped in an flipped over MRAP in Downtown LA.