Airman Austin Bauer, 36th Security Forces Squadron, right, watches a volunteer perform a walk and turn test during field sobriety test training Jan. 29, 2016, at Andersen Air Force Base, Guam. This test challenges an individual's short-term memory, balance and motor skills, which are needed for safe operation of a vehicle. (U.S. Air Force photo/Airman 1st Class Jacob Skovo)