RICO AT THE READY U.S. Navy Petty Officer 2nd Class David Gutierrez performs training exercises with his military working dog, Rico, at the obedience course on Naval Air Station Sigonella, Sicily, Jan. 28, 2009. Military working dogs fill an important role in the Navy by detecting weapons, explosives and narcotics. SHARE: Download: Full Size (0.15688 MB) Tags: Week In Photos, Week In Photos Credit: VIRIN: 284552-L-DHY76-190.jpg Photo Gallery