Is Diego Garcia at Risk of Slipping from Washington's Grasp?

A B-1 Lancer prepares to connect with a KC-135 Stratotanker refueling boom over the Indian Ocean on July 7. The B-1 was flying a close-air-support mission in support of Operation Enduring Freedom. Wikimedia Commons

Diego Garcia’s strategic importance cannot be overstated because the Defense Department has, in general, been gradually reducing its overseas presence throughout the world.

On June 22, 2017, the UN General Assembly voted 94-15 (sixty-five abstentions) to ask the International Court of Justice to issue an advisory opinion on whether the UK had lawfully adhered to the process of decolonization when it detached the Chagos Archipelago from Mauritius in the 1960s. U.S. newspapers mostly ignored this news; hopefully Pentagon planners took note. The timing of this action—which could be viewed as delegitimating the U.S. presence on Diego Garcia, the largest island in the Chagos Archipelago—is not good for the United States. The country has been deepening its defense relations with India and devoting more strategic attention to the Indian Ocean from a security and economic perspective. Approximately 70 percent of the world’s crude oil and 50 percent of the world’s container traffic moves through the Indian Ocean.

The U.S. facility on the island of Diego Garcia is the strategic anchor for the U.S. defense presence in South Asia, the Middle East, and the Pacific region, according to Andrew Erickson from the Naval War College. Diego Garcia could not be more strategically placed because of its unique geography and its relative isolation to areas of conflict. Since 1966, the island has been a secure venue for a number of very important U.S. defense activities.

Technically an atoll, Diego Garcia is under British administrative control. It has an area of roughly sixty-five square miles, yet it offers protected anchorage to U.S. Defense Department maritime prepositioning vessels, repair vessels, refueling facilities and two parallel twelve-thousand-foot runways capable of handling long-range aircraft. The naval base piers are capable of handling U.S. aircraft carriers as well as smaller ships. The location enables long-range bombers, for example, to strike targets in Afghanistan, North Africa, the Persian Gulf and Red Sea, most of Southeast Asia and the Taiwan Strait and return to safety. It is also a safe place for resupply, rearming and repair of submarines and other Navy ships. It has been homeport (and frequent visitor) of deep-draft submarine tenders.

Diego Garcia’s strategic importance cannot be overstated because the Defense Department has, in general, been gradually reducing its overseas presence throughout the world. The U.S. Navy’s Naval Communication Station Harold E. Holt (in western Australia) has provided some rough equivalence in terms of location, isolation, expandability and a friendly host government, but the U.S. Navy left its communication and pier facilities in the mid 1990s. Some contract operations remain but the base has been significantly scaled back from what it once was. With the possible exception of the Defense Department’s presence in Djibouti on the Gulf of Aden (which has access to an airhead and port facilities), there are no facilities on the West Coast of Africa or offshore capable of logistically or politically providing the same sort of base to safely sustain and launch combat operations in multiple theaters of operation. Those who argue that the Defense Department can gain access to suitable replacement facilities underestimate the difficulty it has obtaining access to a foreign territory where it can conduct freedom-to-launch offensive operations, expand facilities or bring in whatever military equipment is necessary to meet operational demands.

History and Legal Basis for the U.S. Presence

Diego Garcia owes its name to a Portuguese navigator who discovered the uninhabited atoll in 1532. The modern history begins in the late eighteenth century, which is when slaves from Africa settled on the archipelago to work on Franco-Mauritian coconut plantations. France administered the archipelago as a dependency known as Ile de France until the British captured the territory in 1812 and renamed it Mauritius. France ceded its rights in 1814 to Great Britain, which has administered it ever since first as a Dependency of Mauritius and later as the British Indian Ocean Territory. The freed slaves and indentured laborers from India lived together as a diverse mix of peoples with their own language, Chagos Kreol. The population was mostly involved in the production of coconut oil.