Staff Sgt. Thomas C. Sullivan Jr., 319th Medical Support Squadron laboratory technician, prepares medical samples for shipment in a box containing dry ice May 22, 2013, at the medical laboratory on Grand Forks Air Force Base, N.D. Dry ice is frequently used to preserve medical samples that must remain frozen or cold during shipment. (U.S. Air Force photo/Staff Sgt. Luis Loza Gutierrez)
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