WATER TRAINING Britta, a military working dog, bites U.S. Air Force Staff Sgt. Roberto Matos during a controlled water aggression exercise at Hurlburt Field, Fla., July 14, 2010. The goal is to allow the dogs to become more comfortable working in a variety of environments. Matos and Britta are assigned to the 1st Special Operations Security Forces Squadron. SHARE: Download: Full Size (0.08 MB) Credit: VIRIN: 210931-R-QTU68-799.jpg Photo Gallery