AT-TAQADDUM, Iraq (July 28, 2008) - Lance Cpl. Tom A. Leu, 20, from Clinton, Iowa, a diesel mechanic with Maintenance Company, 1st Supply Battalion (-) (Reinforced), 1st Marine Logistics Group, swabs the inside of his cheek to collect a DNA sample, July 28. Service members and contract civilians donated an oral swab sample to register for the C.W. Bill Young Department of Defense Marrow Donor Program. (Photo by Lance Cpl. Cindy G. Alejandrez) - AT-TAQADDUM, Iraq (July 28, 2008) - Lance Cpl. Tom A. Leu, 20, from Clinton, Iowa, a diesel mechanic with Maintenance Company, 1st Supply Battalion (-) (Reinforced), 1st Marine Logistics Group, swabs the inside of his cheek to collect a DNA sample, July 28. Service members and contract civilians donated an oral swab sample to register for the C.W. Bill Young Department of Defense Marrow Donor Program. (Photo by Lance Cpl. Cindy G. Alejandrez)