U.S. Air Force Senior Airman Jeffrey Stemley, a 525th

U.S. Air Force Senior Airman Jeffrey Stemley, a 525th Aircraft Maintenance Unit dedicated crew chief, holds a tent tie-down stake while U.S. Air Force Staff Sgt. Anthony Santos, a 525th AMU dedicated crew chief, hammers a tent tie-down stake into the ground for Agile Combat Employment (ACE) base assembly during a Polar Force (PF) 20-1 exercise at Joint Base Elmendorf-Richardson, Alaska, Sept. 30, 2019. PF 20-1 is designed to exercise multiple elements of the ACE concept of operations. These elements include generating fifth-generation combat power from austere locations, command and control using non-traditional methods, and rapid airlift capabilities to sustain a forward operating location. The ACE concept enables the 3rd Wing to deliver lethal airpower for the United States, even in a contested environment.