Senior Airman Joshua Knouff, 91st Missile Wing tactical response force member, briefs his group after an assault clearing procedure conducted at the U-01 training facility during a visit from Chief Master Sgt. Dave Nordel, Twentieth Air Force command chief at Minot Air Force Base, N.D., Sept. 16, 2013. Training of this kind helps to prepare Airmen to respond in the event of an attack on a launch facility in the missile field.(U.S. Air Force photo/Senior Airman Stephanie Sauberan)