The United States Secret Service (USSS) is a federal law enforcement agency with a dual mission: **protecting national leaders and safeguarding the nation’s financial and critical infrastructure**. Established in 1865 initially to combat widespread counterfeit currency following the Civil War, the agency's protective responsibilities expanded after the 1901 assassination of President William McKinley to include safeguarding the President, Vice President, their families, presidential candidates, former presidents, visiting foreign dignitaries, and key government officials[1][2][4]. The Secret Service operates under the Department of Homeland Security since 2003, having been transferred from the Treasury Department, reflecting its broadened scope beyond financial crime to include national security[2]. Its protective mission encompasses physical security for the White House, the Treasury Department, the Vice President’s residence, former presidents' homes, and foreign diplomatic missions in Washington, D.C. The agency leads security planning for National Special Security Events such as presidential inaugurations and major political conventions, employing advance site assessments, intelligence gathering, and coordination with local law enforcement[1]. On the investigative side, the Secret Service continues its legacy fighting financial crimes, including counterfeiting, credit card fraud, identity theft, and increasingly cybercrimes targeting the nation’s financial systems and critical telecommunications infrastructure[1][5]. Agents undergo rigorous training in law enforcement, firearms, protective tactics, and financial crime detection, typically involving an 11-week federal training followed by advanced instruction in Washington, D.C.[3][5]. With over 6,500 personnel including special agents, uniformed division agents, and support staff, the Secret Service is renowned for its highly specialized protective units—such as the Presidential Protection Division—and its unique canine units trained for security operations[3]. Key achievements include preventing numerous assassination attempts on U.S. leaders and securing major national events from threats. Today, the Secret Service remains a vital institution blending traditional law enforcement with cutting-edge technology and intelligence to protect both the country’