Query: In what borough is Fort Hamilton located?
Context: New York City is home to Fort Hamilton, the U.S. military's only active duty installation within the city. Established in 1825 in Brooklyn on the site of a small battery utilized during the American Revolution, it is one of America's longest serving military forts. Today Fort Hamilton serves as the headquarters of the North Atlantic Division of the United States Army Corps of Engineers as well as for the New York City Recruiting Battalion.