U.S. Air Force Airmen prepare for urinalysis testing at Shellbank Fitness Center during Operation Nighthawk at Langley Air Force Base, Va., July 24, 2016. During the operation, 633rd Security Forces Squadron conducted a 100 percent vehicle inspection and military urinalysis testing while using the fitness center to inspect more than 200 vehicles and 300 individuals entering Langley between the hours of 11 p.m. through 3 a.m. (U.S. Air Force photo)