This location is part of the Amend map, which is only found in previous versions of Apocalypse Rising. The Military Airfield, or MA, as most players call it, is located in the northeastern part of the map. Bandits have a tendency to camp out there, as it spawns military packs and weapons, such as the MK48. It is recomended to make your visit there short, unless you are in Gusmanaks AR group and are trying to rank up. It is a great place for getting zombie kills.
The Airfield was removed in 5/27/2013 because of the new 5.0.0 map update.