The claim: 20 miles from Mexican border, 30 miles from Nogales Rex '84 facility.
What it really is: The army base is headquarters of the Army Military Auxiliary Radio System (MARS), and other tenants include the NETCOM/9th Signal Command (A), the United States Army Intelligence Center, Joint Interoperability Test Command, Information Systems Engineering Command (ISEC) and the Electronic Proving Ground. The base is also home to the Western Division of the Advanced Airlift Tactics Training Center (AATTC).
The base itself was designated a National Historical Landmark in 1976. The base also contains two museums (the Fort Huachuca Museum and the US Army Intelligence Museum) as well as being the late summer training grounds for the Arizona Wildcats.
In other words, the base is accessible to the public.