U.S. Air Force Staff Sgt. Michael Stevens gives a thumbs up to indicate that Karo, his military working dog, has positively sniffed out explosive materials on Forward Operating Base Lagman, Afghanistan, Feb. 18, 2011. U.S. Air Force Staff Sgt. Michael Stevens gives a thumbs up to indicate that Karo, his military working dog, has positively sniffed out explosive materials on Forward Operating Base Lagman, Afghanistan, Feb. 18, 2011. SHARE: Download: Full Size (3.33 MB) Tags: Photo Essays Credit: VIRIN: 187817-N-TMP88-875.jpg Photo Gallery