MAYPORT, Fla. (Sept. 15, 2025) Navy and Marine leaders celebrated the opening of UNITAS 2025 from onboard the San Antonio-class amphibious transport docking ship USS Arlington (LPD 24) at Naval Station Mayport September 15, 2025. During UNITAS 2025 the 25 participating nations' forces will perform at-sea, littoral, and amphibious exercises along the East Coast of the United States in advance of the U.S. Navy's 250th Birthday. UNITAS, Latin for Unity, focuses on enhanced interoperability, building regional partnerships, and demonstrating U.S. Naval Forces Southern Command/U.S. 4th Fleet as the trusted maritime partner in the Caribbean, Central and South America. (U.S. Navy photo illustration by Mass Communication Specialist Steven Khor/Released)