Fort Devens is a United States Army Reserve military installation in the towns of Ayer and Shirley, in Middlesex County and Harvard in Worcester County in the U.S. state of Massachusetts. Due to extensive environmental contamination it was listed as a superfund site in 1989. Most of the fort's land was sold off in 1996, but the cantonment area of the post was retained by the Army as the Devens Reserve Forces Training Area (RFTA). Fort Devens was reactivated in May 2007, though no units of active Army have been located there. The Devens Range Complex operates on property in Lancaster, south of Route 2, for live-fire training with small arms, machine guns, grenades, and rockets.