The United States Coast Guard is a military, multimission, maritime service within the Department of Homeland Security. Sector Delaware Bay, a shore-based operational unit of the USCG, is responsible for the execution of all Coast Guard missions within its Area of Responsibility with operational support from Coast Guard Cutters and Air Stations. Sector Delaware Bay is part of the USCG's 5th District, and USCG Station Philadelphia is part of Sector Delaware Bay.