Master Sgt. Zeb Pettersborg of the 446th Aeromedical Evacuation Squadron assists with an aeromedical evacuation simulation as part of Exercise Nexus Dawn at March Air Reserve Base, California, on 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. Reserve Citizen Airmen from Travis, Beale, March, and McConnell Air Force Bases and Joint Base Lewis-McChord participated in the exercise, along with Air National Guardsmen from Fresno, California. (U.S. Air Force Reserve photo by Staff Sergeant Ryan Green)