Which of the following is a branch of the Department of Homeland Security?

The Secret Service is indeed a branch of the Department of Homeland Security (DHS). It was transferred to the DHS when the department was created in 2003, and it primarily handles two main responsibilities: protecting the President and Vice President of the United States, as well as investigating and preventing financial and electronic crimes, including counterfeiting. This makes the Secret Service a critical component of national security efforts under the DHS.

In contrast, the Federal Bureau of Investigation (FBI) operates under the Department of Justice and focuses on federal law enforcement and national security matters, making it distinct from the DHS. The United States Marshals Service (USMS) is also part of the Department of Justice and is responsible for the enforcement of federal laws, management of prisoners, and pursuit of fugitives. Lastly, the Bureau of Alcohol, Tobacco, Firearms, and Explosives (ATF) is another agency under the Department of Justice, primarily dealing with regulations and enforcement related to alcohol and firearms. Thus, while these agencies play important roles in federal law enforcement, only the Secret Service is classified under the Department of Homeland Security.