From left, U.S. Air Force Col. Tom Wilcox, the commander of the 341st Missile Wing, and Chief Master Sgt. Phillip Easton, the wing's command chief, lay a wreath during a 9/11 memorial ceremony at Malmstrom Air Force Base, Mont., Sept. 11, 2014. Terrorists hijacked four passenger aircraft Sept. 11, 2001. Two of the aircraft were deliberately crashed into the World Trade Center in New York, one was crashed into the Pentagon and the fourth crashed near Shanksville, Pa. Nearly 3,000 people died in the attacks. (U.S. Air Force photo by John Turner/Released)