Medical professionals from the Air Force Reserve's 446th Aeromedical Evacuation Squadron here at Joint Base Lewis-McChord, down oxygen masks to simulate aircraft decompression during a training scenario on a McChord Field C-17 Globemaster III aircraft during the unit's in-flight medical training, Jan. 21, 2015. The 2,100 men and women assigned to the 446th AW support the Air Mobility Command (AMC) mission around the world on a daily basis, performing 44 percent of all C-17 missions leaving JBLM. (U.S. Air Force Reserve photo by Jake Chappelle)