The 66th Air Base Group is a non-flying United States Air Force unit assigned to the Air Force Materiel Command Electronic Systems Center. It is stationed at Hanscom Air Force Base, Massachusetts. The group is also the host unit at Hanscom. The 66th ABG provide services to over 3,000 active duty, Reserve and National Guard military personnel and DoD civilians who work and live at Hanscom Air Force Base. Additionally, the 66 ABG supports over 100,000 retired military personnel, annuitants and spouses living in the six-state New England area and New York.