Master Sgt. Sean Costello, 359th Training Squadron technical training flight chief, holds his Senior Master Sgt. promotion certificate at Eglin Air Force Base, FL, March 9, 2018. Costello, a cancer survivor, proudly displays a tattoo on his left wrist symbolizing his experience and all of the Airmen who helped him on his path to overcoming the disease. (U.S. Air Force photo by Jacqueline Jastrzebski)