U.S. Air Force Reserve Senior Airman Derrick Barnes, a crew chief assigned to the 913th Maintenance Squadron, looks on as Lt. Col. Paul Centinaro, commander, 913 MXS, signs his re-enlistment paperwork at Little Rock Air Force Base, Ark., Jan. 31, 2018. Barnes made the commitment to serve his country for an additional six years. (U.S. Air Force photo by Master Sgt. Jeff Walston/Released)