Defense Secretary Chuck Hagel speaks to a few hundred Airmen at Whiteman Air Force Base, Mo., Jan. 13, 2015, during his farewell tour of U.S. military bases. Hagel discussed the vital role the 509th Bomb Wing executes in terms of strategic deterrence. He explained that strategic deterrence is designed to assure any adversary we may face that there is a sufficient deterrent ready and available every day should they be considering action against our country or its allies. (U.S. Air Force photo by Staff Sgt. Alexandra M. Boutte/Released)