Capt. Steve Holekamp, Tinker Fire and Emergency Services, prepares to enter a smoke-filled room during a training exercise at Tinker Air Force Base, Oklahoma, Oct. 6, 2021. Tinker is the first in the Air Force to achieve the International Organization for Standardization’s Class 1 distinction. ISO surveys structure fire suppression capabilities at more than 45,000 areas across the country and grades them on water supply, communications, training, operations and prevention. (U.S. Air Force photo by Paul Shirk)