U.S. Air Force Col. Ricky Mills, 17th Training Wing commander, presents Master Sgt. Adam Heim, 17th Contracting Squadron superintendent, a certificate of promotion to the rank of senior master sergeant during the senior master sergeant release ceremony at the Event Center on Goodfellow Air Force Base, Texas, March 7, 2019. Within the Air Force, only 10 percent of enlisted members will make it to the rank of senior master sergeant. (U.S. Air Force photo by Airman 1st Class Zachary Chapman/Released)