U.S. Air Force Master Sgt. Michael Guderyon, a traditional reservist with the 307th Maintenance Squadron, stands in front of one of the B-52 Stratofortress bombers at Barksdale Air Force Base, Louisiana, March 3, 2018 where he serves as a structural maintenance mechanic. During his civilian time, Guderyon, is also studying to gain his doctorate in Biology of Aging at University of Texas Health Science Center at San Antonio. (U.S. Air Force photo by Master Sgt. Ted Daigle/released)