Packages of red blood cell units sit inside a walk-in refrigerator in the Blood Transshipment Center at Al Udeid Air Base, Qatar, Jan. 13, 2016. The refrigerator can hold 1,000 red blood cell units. The center shipped nearly 23,000 units of blood to more than 30 forward operating locations in the U.S. Central Command area of responsibility in 2015. (U.S. Air Force photo/Tech. Sgt. James Hodgman)

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Photo by: Tech. Sgt. James Hodgman |  VIRIN: 160113-F-YM354-901.JPG