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U.S. Air Force Master Sgt. Krystal Marks, aerospace medicine technician with United States Forces-Iraq, Deputy Commanding General-Advising and Training Health Affairs, demonstrates what five liters of blood might look like on a bleeding victim during the combat lifesaver course Dec. 29, 2009. The students learned to check patients for any visible signs of blood loss during initial assessment. Sergeant Marks is deployed from Pope Air Force Base, N.C., and hails from Warren, Ohio. (U.S. Air Force photo/Master Sgt. Trish Bunting/Released)
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