Air Force Staff Sgt. Devin Pope, 509th Security Forces Squadron (SFS) training instructor, left, demonstrates the Horizontal Gaze Nystagmus (HGN) test with Airman 1st Class John Cabral, 509th SFS member, at Whiteman Air Force Base, Mo., Sept. 30, 2016. As part of Standard Field Sobriety Test used by SFS when a driver is suspected of driving under the influence of alcohol or drugs, patrolmen carry out HGN tests during which they check a driver’s eyes for indications of impairment. ( Air Force photo by 1st Lt. Matthew Van Wagenen)

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Keywords: -2, 509th, bomb, deterrence, forces, security, sfs, wing