Which agency focuses on protecting government officials and infrastructure?

The Secret Service is primarily tasked with protecting high-profile government officials, including the President and Vice President of the United States, as well as visiting foreign dignitaries. In addition to personal protection, the agency also safeguards critical infrastructure, which includes various federal buildings and key national assets. This dual mandate of personal security and infrastructure protection distinguishes the Secret Service from other agencies.

While the ATF focuses on enforcing laws related to alcohol, tobacco, firearms, and explosives, and the FBI handles a broad range of federal investigations and domestic intelligence, neither has a dedicated mission for the protection of government officials and infrastructure similar to that of the Secret Service. The Coast Guard mainly deals with maritime security and safety, ensuring the protection of the nation's waterways, rather than focusing on the protection of government officials. Thus, the Secret Service’s unique role in both personal and infrastructure security makes it the correct answer.