U.S. Air Force Airmen from the 19th Air Support Operations Squadron begin a rucksack march during a German armed forces proficiency assessment, April 6, 2017, at Fort Campbell, Ky. To enhance their ability to work together in deployed locations, members of the German air force travelled to Fort Campbell to train and exercise with the 19th ASOS. (U.S. Air Force photo/Airman 1st Class Daniel Snider)