Seaman Richard Contant from Falls Church, Va., simulates emergency first aid on Seaman Recruit Will McKenzaie from Clovis, Calif., who was a victim of an active shooter during a base-wide exercise on Naval Weapons Station Charleston Sept. 22, 2010. The exercise was held as a joint effort between Air Force and Navy personnel to build the working relationship between both services operating as one team on Joint Base Charleston. (U.S. Navy photo/Mass Communication Specialist 1st Class Jennifer R. Hudson/released)

Patrolman Benjamin Mcswain, front, from Gastonia, N.C., and Master-at-Arms 2nd Class Sherman Widbee from Richmond, Va., disarm a simulated aggressor, played by Firearms Instructor J.D. Rowe from Natchez, Mo., during a base-wide active shooter exercise on Naval Weapons Station Charleston Sept. 22, 2010. All three are assigned to the Naval Weapons Station Charleston security department. (U.S. Navy photo/Mass Communication Specialist 1st Class Jennifer R. Hudson/released)

Fireman Eric Kelly, right, from Detriot, Mich., and Capt. Stanley Brown transport a victim who received a simulated gunshot wound to the chest during a base-wide active shooter exercise on Naval Weapons Station Charleston Sept. 22, 2010. The exercise was held as a joint effort between Air Force and Navy personnel to build the working relationship between both services operating as one team on Joint Base Charleston. Both Fireman Kelly and Captain Brown are with the NWS Charleston fire department. (U.S. Navy photo/Mass Communication Specialist 1st Class Jennifer R. Hudson/released)

Patrolman Benjamin Mcswain, right, from Gastonia, NC, and partner Master-at-Arms 2nd Class Sherman Widbee from Richmond, Va., respond as the first on scene during a base-wide active shooter exercise on Naval Weapons Station Charleston Sept. 22, 2010. Both Patrolman Mcswain and Master-at-Arms Widbee are with the Naval Weapons Station Charleston security department. (U.S. Navy photo/Mass Communication Specialist 1st Class Jennifer R. Hudson/released)

Private 1st Class Scott Derrick attached to the Special Response Team with the Goose Creek Police Department, gathers information on a simulated shooter during an exercise on Naval Weapons Station Charleston Sept. 22, 2010. Goose Creek Police Department police officers played a vital role, displaying their tactical proficiency. The exercise was held as a joint effort between Air Force and Navy personnel to build the working relationship between both services operating as one team on Joint Base Charleston. (U.S. Navy photo/Mass Communication Specialist 1st Class Jennifer R. Hudson/released)

Fireman Joel Woods, assigned to the Naval Weapons Station Charleston fire department, tends to Seaman Apprentice Joshua Julian from Woodinville, Wash., after he received a simulated gunshot wound to the neck during a base-wide active shooter exercise on Naval Weapons Station Charleston Sept. 22, 2010. The exercise was held as a joint effort between Air Force and Navy personnel to build the working relationship between both services operating as one team on Joint Base Charleston. (U.S. Navy photo/Mass Communication Specialist 1st Class Jennifer R. Hudson/released)