Major General Fred Stoss, 20th Air Force commander, and Chief Master Sgt. Thomas Good, 20th Air Force command chief, pose for a photo with the current class at the School of Advanced Nuclear Deterrence Studies at Kirtland Air Force Base, N.M., Feb. 14, 2018. This was Stoss’ first visit to Kirtland as the 20th AF commander since taking command of the numbered air force on Jan. 26, 2018. (U.S. Air Force Photo by Senior Airman Chandler Baker)