LUCCA'S YAWN U.S. Marine Gunnery Sgt. Lucca, an explosive-detection dog, shows off her formidable teeth while yawning on Camp Echo, Iraq, Jan. 10, 2009. Lucca, assigned to the 4th Infantry Division's 2nd Brigade Combat Team, is a mix of Belgian Malinois and German Shepherd and has served in the Marine Corps for more than two years. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 532954-J-RGY00-480.jpg Photo Gallery