4/21/2011 - HANSCOM AIR FORCE BASE, Mass. – Senior Airman Elias Musallam and Tech Sgt. Wayne Griggs enter Building 1810 during the active shooter Base Readiness Exercise scenario April 14. Several exercises are planned for the next few months to prepare personnel for an impending Operational Readiness Inspection in the fall. (U.S. Air Force photo by Rick Berry)

4/21/2011 - HANSCOM AIR FORCE BASE, Mass. - Todd Grierson, from the Hanscom Fire Department, works at an auto extraction scenario at the corner of Randolph Road and Tinker Loop during the Base Readiness Exercises April 14. Several exercises are planned for the next few months to prepare personnel for an impending Operational Readiness Inspection in the fall. (U.S. Air Force photo by Linda LaBonte Britt)