Marine Barracks San Juan

Marine Barracks San Juan was established in Puerto Rico in the early 20th century, following the United States' acquisition of the island after the Spanish-American War. The barracks served as the headquarters for U.S. Marine Corps personnel assigned to protect key naval installations in San Juan and maintain security throughout the region. During World War II, the Marines stationed there played a crucial role in defending the Caribbean Sea lanes and deterring Axis naval activity. The unit remained active until its eventual deactivation as U.S. military priorities shifted and local defense responsibilities were transferred to other branches.