Brian P. McKeon, Principal Deputy Under Secretary of Defense for Policy, addresses 90th Missile Wing Airmen during his visit to F.E. Warren Air Force Base, March 16, 2015. McKeon’s visit aligns with the Department of Defense’s efforts to review and assess the status and direction of the nuclear enterprise, as well as the morale and welfare of the Airmen who carry out the nuclear mission, following the publication of the Nuclear Enterprise Reviews in 2014. The 90th Missile Wing houses and maintains 150 of the Minuteman III inter-continental ballistic missiles used in support of U.S. Strategic Command’s strategic deterrence mission, as well as the command and control systems required to launch them. U.S. Strategic Command is one of nine U.S. Department of Defense unified combatant commands, and is responsible for strategic deterrence, space operations, cyberspace operations, joint electronic warfare, global strike, missile defense, intelligence, surveillance and reconnaissance, combating weapons of mass destruction, and analysis and targeting. (U.S. Air Force photo by Lan Kim)