Civilian military police officers with the Marine Corps Base Hawaii Provost Marshal's Office simulate clearing a hall after an active shooter drill at the U.S. Marine Corps Forces, Pacific headquarters building during Exercise Lethal Breeze 2013, Sept. 10, 2013. Marine Corps Base Hawaii conducts this force protection exercise every year in order to provide emergency responders an opportunity to hone life-saving security procedures. (U.S. Marine Corps photo by Cpl. Isis Ramirez) - Civilian military police officers with the Marine Corps Base Hawaii Provost Marshal's Office simulate clearing a hall after an active shooter drill at the U.S. Marine Corps Forces, Pacific headquarters building during Exercise Lethal Breeze 2013, Sept. 10, 2013. Marine Corps Base Hawaii conducts this force protection exercise every year in order to provide emergency responders an opportunity to hone life-saving security procedures. (U.S. Marine Corps photo by Cpl. Isis Ramirez)