KADENA AIR BASE, Japan -- Tech. Sgt. Kevin Mathews, 18th Aeromedical Evacuation Squadron, performs an operational check on his quick-donning oxygen mask to ensure it is functionally working prior to a flight. Members of the 18th AES depend on various squadrons and base agencies, including the 909th Air Refueling Squadron's aircrew life support shop, for mission support. (Air Force photo courtesy of 18th Wing Public Affaris)
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