U.S. Air Force Airman 1st Class Mark Arroyo, 436th

U.S. Air Force Airman 1st Class Mark Arroyo, 436th Civil Engineer Squadron water and fuels system maintainer, Dover Air Force Base, Delaware, fills out in-processing forms to participate in Exercise Mobility Guardian 2019 at Fairchild Air Force Base, Washington, Aug 16, 2019. Exercise Mobility Guardian is Air Mobility Command’s premier, large-scale mobility exercise during which more than 2,500 Mobility Airmen will participate. (U.S. Air Force photo by Staff Sgt. Dustin Mullen)