Tech. Sgt. Ollie Bradley, 36th Security Forces Squadron flight chief, left, conducts a horizontal gaze nystagmus test during field sobriety test training Jan. 13, 2016, at Andersen Air Force Base, Guam. Security Forces members practiced conducting sobriety tests including the one-leg stand, walk and turn, and horizontal gaze nystagmus test as part of their field sobriety test training. (U.S. Air Force photo/Airman 1st Class Jacob Skovo)