U.S. Air Force Airmen from the 133rd Airlift Wing prepare to take off in a C-130 Hercules in St. Paul, Minn., May 19, 2018. The Airmen are taking part in an exercise where they will receive in depth training on Ability-To-Survive and Operate (ATSO) principles while supporting airlift and aeromedical flight operations. (U.S. Air National Guard photo by Tech. Sgt. Austen R. Adriaens)