The U.S. Forest Service has activated two military air tankers, Modular Airborne FireFighting System (MAFFS), out of the 146th Airlift Wing, Channel Islands Air National Guard Station in southern California. Eight National Guard or Air Force Reserve C-130s can be called up when privately owned contracted air tankers are committed on fires or initial attack. Presently there are about 17 large air tankers on exclusive use contract with the U.S. Forest Service, down from 44 in 2002.