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Staff Sgt. Vincent Len, 332nd Expeditionary Logistics Readiness Squadron, swabs the inside of his cheek to collect a DNA sample during a bone marrow registry drive at an undisclosed location in Southwest Asia, Jan. 22, 2012. In addition to a completed registration form, four cotton swabs of DNA were needed to become a donor. Len is deployed from Minot Air Force Base, N.D. and is a native of San Jose, Calif. (U.S. Air Force photo by Staff Sgt. Joshua J. Garcia/Released)
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