Fort Huachuca is a United States Army installation, established 3 March 1877 as Camp Huachuca. The garrison is now under the command of the United States Army Installation Management Command. It is located in Cochise County, in southeast Arizona, about 15 miles (24 km) north of the border with Mexico and at the northern end of the Huachuca Mountains, next to the town of Sierra Vista. From 1913 to 1933 the fort was the base for the "Buffalo Soldiers" of the 10th Cavalry Regiment. During the buildup of World War II, the fort had quarters for more than 25,000 male soldiers and hundreds of WACs. In the 2010 census, Fort Huachuca had a population of about 6,500 active duty soldiers, 7,400 military family members and 5,000 civilian employees. Fort Huachuca has over 18,000 people on post during the peak working hours of 0700 and 1600 on week days, making it one of the busiest Army installations.
The major units are the United States Army Network Enterprise Technology Command (NETCOM) and the United States Army Intelligence Center. Libby Army Airfield is on post and shares its runway with Sierra Vista Municipal Airport. It was an alternate landing location for the space shuttle, but it was never used as such.
Fort Huachuca is also the headquarters of Army Military Auxiliary Radio System (MARS). Other units include the Joint Interoperability Test Command, the Information Systems Engineering Command (ISEC) and the Electronic Proving Ground.
The fort has a radar-equipped aerostat, one of a series maintained for the Drug Enforcement Administration by Harris Corporation. The aerostat is northeast of Garden Canyon and supports the DEA drug interdiction mission by detecting low-flying aircraft attempting to enter the United States from Mexico.
Fort Huachuca contains the Western Division of the Advanced Airlift Tactics Training Center (AATTC) which is based at the 139th Airlift Wing, Rosecrans Air National Guard Base, Saint Joseph, Missouri.
Sierra Vista, which annexed the post in 1971, is located south and east of the post, and Huachuca City is to the north and east.