By Maj. Denise Hauser, 940 Air Refueling Wing / Published April 30, 2021 Civil Engineer Airmen assigned to the 940th Air Refueling Wing and 9th Reconnaissance Wing don their chemical warfare gear during Exercise Nexus Dawn at Beale Air Force Base, California, April 27. Nexus Dawn tested certain Air Force units to make sure they are trained, equipped and combat-ready to employ and sustain operations in degraded and contested environment. (U.S. Air Force photo by Maj. Denise Hauser) Civil Engineer Specialists with the 940th Air Refueling Wing and 9th Reconnaissance Wing do a Post Attack Reconnaissance (PAR) sweep after a simulated attack during Exercise Nexus Dawn at Beale Air Force Base, California, April 27. Nexus Dawn tested certain Air Force units to make sure they are trained, equipped and combat-ready to employ and sustain operations in degraded and contested environment. (U.S. Air Force photo by Maj. Denise Hauser)