Where is the headquarters for the 4th Fleet located?

The headquarters for the 4th Fleet is indeed located in Mayport, Florida. This fleet was established to provide naval forces to support U.S. national interests in the Caribbean, Central and South America, and the surrounding waters. Mayport is strategically positioned for operations in these regions, allowing for quick deployment and support of maritime security operations. Additionally, Mayport has a significant naval base that supports various naval capabilities, making it a suitable headquarters location for the fleet's operations and strategic planning.