Maj. Stanley Paregien from Scott Air Force Base, Ill, and Master Sgt. Joseph Mather from Robins AFB, Ga., both students in the Advanced Contingency Skills Training Course 09-1, learn about the Defense Advanced GPS Receiver during a class for ACST Oct. 8, 2008, on Fort Dix, N.J. ACST is taught by the U.S. Air Force Expeditionary Center's 421st Combat Training Squadron and prepares Airmen for upcoming deployments. (U.S. Air Force Photo/Tech. Sgt. Lionel Castellano)
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