Senior Airman Michael Ripple, 791st Missile Security Forces Squadron response force leader and Staff Sgt. Calvin Smith, 91st Missile Security Force Squadron flight security controller, review a pre-mission vehicle checklist at Minot Air Force Base, N.D., Mar. 28, 2017. Vehicle checks help prevent breakdowns and identify other potential problems. (U.S. Air Force photo/Airman 1st Class Austin M. Thomas)