U.S. Air Force Senior Airman Joshua Carbone, 99th Security Forces Squadron patrolman, scans an area outside of a classroom during the Multi Assault Counter Terrorism Action Capabilities training located at Lomie Heard Elementary School, March 28, 2012, at Nellis Air Force Base, Nev. The exercise focused on response, tactics, terminating threats, evacuation of personnel, containment, and securing a crime scene for investigation.