Giving blood to brothers in arms
Blood bags sit inside a cooler after being extracted from volunteer donors during the Armed Services Blood Bank Center’s blood donation on Joint Base Andrews, Md., Feb. 6, 2017. Each bag of blood is from a different donor and holds approximately 450 to 500 milliliters of blood. (U.S. Air Force photo by Senior Airman Philip Bryant)

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Photo by: Senior Airman Philip Bryant |  VIRIN: 170206-F-IP635-0174.JPG