Canteens are one of the last items Airmen pick up in the pre-deployment function line. Airmen use a special cap on the canteen to consume water while wearing the gas mask in mission oriented protected posture gear. (U.S. Air Force photo by Airman 1st Class Kristine M. Gruwell)

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Photo by: Airman 1st Class Kristine M. Gruwell |  VIRIN: 180221-F-ID976-2069.JPG