Civil engineering Airmen are introduced to a replica of a damaged flightline during a tabletop exercise at Alpena Combat Readiness Training Center, Mich., May 22, 2021. The purpose of the tabletop exercise was to familiarize civil engineering Airmen with Rapid Airfield Deployment Recovery program and introduce them to scenarios from a leadership perspective during Exercise Mobility Guardian 2021. Mobility Guardian is the Air Force's largest and longest exercise ensuring readiness to move personnel and equipment in combat operations. (U.S. Air Force photo by Tech. Sgt. Kentavist P. Brackin)