U.S. Air Force Staff Sgt. Ryan Gulley, 633rd Security Forces Squadron unit trainer, looks at a disbelieving volunteer’s blood alcohol content level during a “driving” under the influence training exercise at Langley Air Force Base, Va., Sept. 23, 2014. Gulley said the realistic training exercise is the best way to show Airmen critical law enforcement skills inside a controlled environment. (U.S. Air Force photo by Senior Airman Austin Harvill/Released)