VANDENBERG AIR FORCE BASE, Calif. -Staff Sgt. David Alfonso, of the 30th Civil Engineer Squadron, points to an area that Airman 1st Class Tyson Duncan, of the 30th CES, is to cover during a CE convoy exercise here Thursday, Sept. 22, 2011. The 30th CES conducts monthly training in order to better prepare its Airmen for the tasks they are traditionally commanded to perform while deployed. (U.S. Air Force photo/Senior Airman Lael Huss
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