HILL AFB, UT, UNITED STATES 01.30.2019 - After recently receiving a new look and modifications at the Ogden Air Logistics Complex, the NF-16D known as VISTA (Variable stability In-flight Simulator Test Aircraft), departs Hill Air Force Base, Utah, Jan 30, 2019. This aircraft is the only one of its kind in the world and is the flagship of the United States Air Force Test Pilot School. This F-16 has been highly modified, allowing pilots to change the aircraft flight characteristics and stability to mimic that of other aircraft. (U.S. Air Force photo by Alex R. Lloyd)