U.S. Air Force Staff Sgt. Karin Mayville, 366th Munitions Squadron Unit Command and Control lead, evacuates a simulated demolished building during a Phase II exercise on Mountain Home Air Force Base, Idaho, Oct. 26, 2021. The purpose of Phase II training exercises is to test service members’ ability to survive and operate in a contested environment. (U.S. Air Force photo by Airman 1st Class Krista Reed Choate)