CANINE CARLA U.S. Army Sgt. Craig Walker and his working dog, Staff Sgt. Carla take a brief break in an open lot while searching for weapons cache in Risalah, Baghdad on Sept. 15, 2008. Walker and Carla, who are assigned to the 4th Infantry Division, got a chance to rest while other soldiers assigned to the 64th Armored Calvary Regiment, 4th Brigade, 3rd Infantry Division patrolled the area. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 795030-D-GCW81-766.jpg Photo Gallery