U.S. Air Force Master Sgt. Todd Prater, assigned to 182nd Airlift Wing, Illinois Air National Guard, uses a chainsaw to start the process of repairing a flight line maintenance ramp during the Deployable Air Base System proof of concept exercise at the 31st Tactical Air Base, Poznan-Krzesiny, Poland, July 30, 2018. The exercise tests and enhances the ability to rapidly deploy within theatre, preposition equipment and enables the execution of current operations, exercises and contingencies. (U.S. Army photo by Spc. Craig Jensen)