Military Presence and Strategic History of the U.S. Virgin Islands

The U.S. Virgin Islands occupy a position of sustained strategic importance in the Caribbean, shaped by the islands' location at the northeastern entrance to the Caribbean Sea and their proximity to the Panama Canal shipping corridor. Federal military activity in the territory spans more than a century, beginning with the 1917 transfer from Denmark and continuing through active installations, training operations, and defense infrastructure that persist into the 21st century. The record of military presence intersects directly with questions of territorial governance, federal authority, and the rights of residents — subjects documented across the U.S. Virgin Islands Territory Authority.

Definition and scope

Military presence in the U.S. Virgin Islands refers to the history of federal armed forces installations, acquisitions, and strategic operations conducted within or from the territory's land and marine boundaries. The scope encompasses the original strategic rationale for U.S. acquisition, World War I and World War II-era fortification, Cold War deployments, and the residual federal defense footprint that shapes land use and inter-agency authority in the territory.

The territory consists of 3 principal islands — Saint Croix, Saint Thomas, and Saint John — plus approximately 50 smaller cays and islets, covering a total land area of 133 square miles (U.S. Census Bureau, Geographic Profiles). That compact geography has historically concentrated military infrastructure in specific high-value locations: Charlotte Amalie harbor on Saint Thomas, the Krause Lagoon channel on Saint Croix, and the deep-water anchorages accessible to naval surface vessels throughout the chain.

The legal framework governing federal military land use in the territory derives from the Revised Organic Act of 1954 (48 U.S.C. §§ 1541–1645), which confirmed federal supremacy over defense-related matters while establishing the territorial government's civil administration authority. Federal military installations in the territory operate outside territorial tax jurisdiction and are not subject to USVI legislative authority.

How it works

The strategic logic behind U.S. acquisition of the Danish West Indies in 1917 was exclusively naval. The purchase price was $25 million in gold — at the time, one of the largest territorial purchase transactions in U.S. history — and the primary motivation documented by the U.S. Navy was denial: preventing Germany from acquiring a Caribbean submarine base during World War I (National Archives, Records of the Department of State, RG 59).

Following acquisition, the Navy administered the islands directly from 1917 to 1931, with naval officers serving as governors. This arrangement gave the Department of the Navy direct control over civil administration, port infrastructure, and public works — a consolidation with no parallel in continental U.S. governance. The transfer of civil administration to the Department of the Interior in 1931 ended naval governance but did not end the military footprint.

During World War II, the federal government expanded fortifications across the territory. Saint Thomas hosted submarine patrol aircraft operations, and Bourne Field (now Cyril E. King Airport) was constructed in part to support military aviation. The submarine base at Saint Thomas, established during the war, supported anti-submarine warfare operations in the Atlantic-Caribbean theater. On Saint Croix, the Richmond Peak installation served as an early warning radar site. Operational details of these installations are documented in records held by the National Archives under Record Group 181, Records of Naval Districts and Shore Establishments.

The Cold War period brought radar and communications infrastructure rather than large troop deployments. The Buck Island area east of Saint Croix was used for underwater weapons testing under the management of the Atlantic Fleet Weapons Training Facility (AFWTF), a range complex administered by the U.S. Navy that at its peak encompassed significant portions of the eastern Caribbean. The AFWTF remains an active range complex, operating from Roosevelt Roads in Puerto Rico, and continues to use airspace and sea space within USVI jurisdictional waters for training exercises.

Common scenarios

The intersection of military history and current territorial operations produces four recurring administrative and legal scenarios:

  1. Environmental remediation disputes: Former military sites on Saint Croix and Saint Thomas carry legacy contamination from fuel storage, ordnance testing, and industrial operations. The Environmental Protection Agency (EPA Superfund program) has listed USVI military legacy sites for assessment, and disputes over remediation responsibility between the Department of Defense and territorial government agencies are a recurring feature of land administration.

  2. Land transfer negotiations: Parcels previously held by the federal military have been subject to transfer negotiations between the Department of the Interior, the Department of Defense, and the Government of the U.S. Virgin Islands. The disposition of former naval properties affects territorial land use planning, housing development, and economic development authority.

  3. Active training operations: The Navy and Coast Guard conduct ongoing maritime operations in USVI waters, including search and rescue, drug interdiction coordination, and training exercises. These operations require coordination with the USVI Port Authority and territorial emergency management agencies.

  4. National Guard structure: The Virgin Islands National Guard operates under Title 10 and Title 32 of the U.S. Code, subject to dual state-federal authority — with the Governor of the USVI serving as Commander in Chief for territorial purposes, and the Department of Defense holding federal activation authority. The Guard's structure mirrors continental state National Guard organizations despite the territory's non-state status.

Decision boundaries

The critical distinction in USVI military governance is between federal defense jurisdiction and territorial civil authority. Active federal installations and designated defense areas fall entirely under federal authority — the territorial government has no regulatory, taxing, or zoning power over these areas. Former military properties that have been transferred or declared surplus revert to standard territorial land administration, subject to USVI legislative and executive authority.

A second boundary separates military operations from law enforcement: the Posse Comitatus Act (18 U.S.C. § 1385) applies to the USVI, restricting the use of federal military forces in civilian law enforcement roles. Coast Guard operations in USVI waters are not subject to this restriction, as the Coast Guard functions as a law enforcement agency. This distinction is operationally significant given the territory's position on Caribbean drug and migration routes.

For the full governmental and administrative context within which military authority operates alongside civil territorial governance, the U.S. Virgin Islands Government Authority Reference documents the structure of executive, legislative, and judicial functions, the interplay between federal and territorial law, and the agencies responsible for land use, emergency management, and intergovernmental relations.

References

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