Gen. Glen VanHerck, United States Air Force Warfare Center commander, and Col. David Avila, Nevada Test and Training Range commander, pose for a photo after Avila assumed command July 8 on Nellis Air Force Base, Nev. The NTTR, provides the warfighter a flexible, realistic and multidimensional battle-space to conduct testing tactics development, and advanced training in support of U.S. national interests.