U.S. Air Force Col. Ricky Mills, 17th Training Wing commander, greets Under Secretary of the Air Force Matthew P. Donovan at Goodfellow Air Force Base, Texas, Feb. 13, 2019. Goodfellow was the first stop on Donovan’s tour of Air Education Training Command bases to see how they build a lethal and ready force through innovation and training. (U.S. Air Force photo by Airman 1st Class Zachary Chapman/Released)