Serving through the holidays: Senior Airman Mark Kreul
South Dakota Air National Guardsman Senior Airman Mark Kreul is on duty this holiday season working with the U.S. Border Patrol to bolster security along the U.S.-Mexico border as part of Operation Jump Start. Airman Kreul, who works at the U.S. Border Patrol's Yuma, Ariz., sector headquarters, is an intelligence analyst for Task Force Yuma. When not deployed with the National Guard, he is a full-time student at South Dakota State University. (U.S. Air Force photo/Staff Sgt. Dan Heaton)