Reserve Citizen Airmen practice patient litter carry during Exercise NEXUS DAWN at March Air Reserve Base, California, April 26, 2021. NEXUS DAWN is a readiness exercise designed to test the ability of certain Air Force Reserve units to generate, employ and sustain air operations in a simulated combat environment. Missions included in NEXUS DAWN are aeromedical evacuation, airlift for cargo and personnel, aerial refueling, deployment processing, aerial port operations, and command and control. (U.S. Air Force photo by Staff Sgt. Nicole Erb)