Master Sgt. Kimelyn Hall, 36th Aeromedical Evacuation Squadron aeromedical evacuation technician, tests her self-contained breathing apparatus on a C-17 Globemaster III aircraft from the 183rd Airlift Squadron during Southern Strike 2018 at the Gulfport Combat Readiness Training Center, Mississippi, Oct. 30, 2017. Southern Strike 2018 is a large-scale, joint multinational combat exercise that provides tactical level training for the full spectrum of conflict and emphasizes air dominance, maritime operations, maritime air support, precision engagement, close air support, command and control, personnel recovery, aeromedical evacuation, and combat medical support. (U.S. Air Force photo by Tech. Sgt. Ryan Labadens)