Diego Garcia is an atoll in the Indian Ocean of Earth, about 1,000 miles south of the southern India coast and far east of the "African Horn". Diego Garcia houses a military base of the United Nations Space Command.
Due to the atoll's proximity to India, Hong Kong, Pakistan, and Africa, the United Kingdom established a military base on Diego Garcia for both training and refueling purposes. The base has been in use ever since, under control of the United Kingdom and later the United States. The base later became under the control of the Unified Earth Government's United Nations Space Command.
On October 20, 2552, when the Covenant's Fleet of Sacred Consecration arrived at Earth, the military base on Diego Garcia was immediately alerted to the Covenant's presence. The base launched the first counterattacks against the Covenant when they invaded New Mombasa in Kenya, Africa during the subsequent Battle for Earth. These attacks proved effective as, later in the battle, a Covenant capital ship was sent to Diego Garcia to destroy the base. The base survived the Human-Covenant War and is still in use by the UNSC as of 2553.
Diego Garcia was mentioned in the Halo 2 E3 demo as being the base of the "405th", a Marine unit that became A Company in the finished game. Diego Garcia's existence as a military base, with units involved in the fighting at Mombasa, was later made official by the Halo Encyclopedia.
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