Senior Airman Caleb Green and Airman Bryce Willsey simulate the walk-and-turn portion of the field sobriety test Dec. 10, 2014, on Grand Forks Air Force Base, N.D. The FST consists of three different portions and is used to test a subject who is believed to be intoxicated. During the walk-and-turn portion, the subject is asked to walk nine steps in a straight line, heel-to-toe, and then turn around and walk in the opposite direction in the same fashion with the same number of steps. Green is a 319th Security Forces Squadron base defense operations control controller/patrolman. Willsey is a 319th SFS alarm monitor. (U.S. Air Force photo/Airman 1st Class Bonnie Grantham)