Dunno about the US Army, but the Navy has a lot of ships there, and I think Atlantic Fleet's HQ. Lots of Marine & Navy installations around, such as the amphibious force's bases (includes Special Warfare).
Wikipedia says that nearby Fort Monroe is the HQ for the Army's Training & Doctrine Command. The fort closed in 2005.
That's all I have, someone who's been there may have more for you.
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My Twilight claim to fame: I ran "Allegheny Uprising" at Allegheny College, spring of 1988.
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