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