Moore Army Airfield, located near the former Fort Devens, was built in 1940. During the Second World War it was also used by the Navy, and was referred to as Ayer Naval Auxiliary Air Station. The airfield originally consisted of three paved runways, taxiways and a ramp. Moore Army Airfield was declared excess when Fort Devens was downgraded to a training area, and was closed in the late 1990s. You can read additional information here .
It is on these now disused runways where the autocross events take place.
Note: Moore Army Airfield is just off of Route 2A which is separate from the former main Army base.