High Quality Content by WIKIPEDIA articles! The Massachusetts Department of Correction is responsible for operating the prison system of the Commonwealth of Massachusetts, US Massachusetts houses over 11,500 inmates (about 1,820 are serving life sentences) throughout 18 correctional facilities and employs over 5,000 employees (about 4,000 of whom are correctional officers). The MA DOC also has a tactical unit, a fugitive apprehension unit, a gang intelligence unit, a K-9 team, a Special Reaction Team (SRT), and a Tactical Response Team (TRT). Both of these tactical units are highly trained and are paramilitary teams. The Massachusetts DOC is the largest law enforcement agency in the state of Massachusetts with a staff of 5,000, 4,000 of which are sworn officers. The agency is headquartered in Milford.