John Knipe, right, a high risk response instructor, briefs U.S. airmen and civilian law enforcement members before conducting active shooter training at the base exchange on Joint Base Elmendorf-Richardson, Alaska, May 15, 2015. John Knipe, right, a high risk response instructor, briefs U.S. airmen and civilian law enforcement members before conducting active shooter training at the base exchange on Joint Base Elmendorf-Richardson, Alaska, May 15, 2015. SHARE: Download: Full Size (1.83 MB) Tags: Photo Essays Credit: VIRIN: 801275-G-CYE92-068.jpg Photo Gallery