ASTA ATTACK Asta, a military police working dog, attacks U.S. Navy Petty Officer 2nd Class William Bryan during a controlled aggression demonstration at Ford Island on Joint Base Pearl Harbor-Hickam, Hawaii, April 13, 2013. The military uses working dogs to apprehend suspects and to detect explosives and narcotics while searching buildings, ships and submarines. Bryan is a master-at-arms. SHARE: Download: Full Size (0.08 MB) Credit: VIRIN: 695199-Y-XSV74-755.jpg Photo Gallery