GRAND FORKS AIR FORCE BASE, N.D. ? Marine Sgt. Geoffrey Kruse, assesses the base perimeter fence during a field exercise as part of a five-day anti-terrorism, threat reduction conference here April 19. More than 93 instructors and students (enlisted, officers and civilians from every branch of the military) attended the conference that covered terrorist options, security operations, structural engineering and security engineering, infrastructure engineering and emergency management. (U.S. Air Force photo/Senior Airman J. Paul Croxon)
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