Which entity is responsible for operating U.S. customs at ports of entry?

The Office of Field Operations is responsible for operating U.S. customs at ports of entry. This office is a part of U.S. Customs and Border Protection (CBP), which is under the Department of Homeland Security (DHS). The role of the Office of Field Operations involves the inspection and processing of people and goods entering the United States at various points like airports and border crossings. They ensure compliance with U.S. entry laws and customs regulations, playing a critical part in maintaining national security while facilitating lawful trade and travel.

The other entities listed serve different functions; for instance, the U.S. Marshals primarily handle law enforcement tasks related to the judicial system, while the Federal Bureau of Prisons manages federal incarceration facilities. Although the Department of Homeland Security oversees customs regulations in a broader sense, it is the specific operations at ports that are delegated to the Office of Field Operations. Therefore, this office is uniquely equipped and charged with the direct responsibility for customs duties at entry points.