Under Secretary of the Air Force Matthew P. Donovan, wears a virtual reality headset as he experiences a virtual reality demonstration used for technical training at Sheppard Air Force Base, Texas, Feb. 14, 2019. Sheppard AFB leveraged the technology as another tool to enhance training and develop Mach-21 Airmen in areas such as aircraft maintenance and civil engineering. (U.S. Air Force photo by Airman 1st Class Madeleine E. Remillard)