Army Staff Sgt. Sergio Lopez, assigned to the Schinnen Provost Marshall Office at Army Garrison Benelux, explains how to perform a horizontal gaze nystagmus test to Army Sgt. Chase Sykes, during standard field sobriety test training on Chièvres Air Base, Belgium, Dec. 5, 2017. The Soldiers practiced performing field sobriety tests to receive law enforcement certification. ( Army photo by Visual Information Specialist Pierre-Etienne Courtejoie)

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Photo credit: © AB Forces News Collection / Alamy / Afripics
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