Warrenton Training Center Site B, Virginia

A closed and classified U.S. government facility, involved principally in communications, containing underground facilities. Site B is the headquarters, associated with three other nearby locations: Site A, C and D. Site A is more of a training facility, Sites C and D are antenna facilities. Warrenton is on the LSI fiber optic network and was part of the National Communications System, until 2012, when oversight of NCS programs was transferred to the Department of Homeland Security's Office of Cybersecurity and Communications.