CBP Office of Field Operations

The Office of Field Operations (OFO) is a federal law enforcement agency within the U.S. Customs and Border Protection (CBP) responsible for managing United States customs operations at 20 Field Operations offices, 328 ports of entry, and 16 pre-clearance stations in Canada, Ireland, the UAE, and the Caribbean. Headed by an Executive Assistant Commissioner, OFO directs the activities of roughly 33,000 employees.

Source: Wikipedia — CBP Office of Field Operations (CC BY-SA 4.0)