4th Fleet

U.S. FOURTH Fleet supports USSOUTHCOM (U.S. Southern Command) joint and combined full spectrum military operations by providing principally sea based, forward presence to ensure freedom of maneuver in the maritime domain, to foster and sustain cooperative relationships with international partners and to fully exploit the sea as maneuver space in order to enhance regional security and promote peace, stability, and prosperity in the Caribbean, Central and South American regions.
Fourth Fleet headquarters is co-located with USNAVSO headquarters in Mayport, Florida, and is commanded under a two-star admiral.U.S.
Fourth Fleet has five missions: support for peacekeeping, humanitarian assistance, disaster relief, traditional maritime exercises, and counterdrug support operations.