U.S. Airmen assigned to the 20th Aircraft Maintenance Squadron, 55th Aircraft Maintenance Unit (AMU,) pose next to a 100th anniversary mural in the 55th AMU building at Shaw Air Force Base, S.C., April 28, 2017. The mural commemorates a century of accomplishments since the 55th Fighter Squadron’s creation in 1917. (U.S. Air Force photo by Senior Airman Kelsey Tucker)