ANDERSEN AIR FORCE BASE, Guam—Chico, U.S. Department of Agriculture canine and his handler prepare to inspect a KC-135 Stratotanker for brown tree snakes, July 24. All aircraft that depart from Andersen AFB and are scheduled to land at a location other than Guam are searched by the USDA canine unit to ensure brown tree snakes do not leave Guam. (Air Force photo by Senior Airman Benjamin Wiseman/Released)