Marine Corps police officers with the Special Reaction Team perform room-clearing operations alongside the U.S. Marshals Gulf Coast Regional Fugitive Task Force during a training exercise at the Marine Corps Support Facility, July 2. This is one of multiple joint-training evolutions in which the SRT has honed their skills as a fully-functional force capable of addressing any high-risk situation that occurs at MARCORSPTFAC. (U.S. Marine Corps photo by Cpl. John M. McCall) - Marine Corps police officers with the Special Reaction Team perform room-clearing operations alongside the U.S. Marshals Gulf Coast Regional Fugitive Task Force during a training exercise at the Marine Corps Support Facility, July 2. This is one of multiple joint-training evolutions in which the SRT has honed their skills as a fully-functional force capable of addressing any high-risk situation that occurs at MARCORSPTFAC. (U.S. Marine Corps photo by Cpl. John M. McCall)

Sgt. Alex Bolicke, training non-commissioned officer for Headquarters Battalion, Marine Forces Reserve acts as a gunman in an active-shooter drill held at the Marine Corps Support Facility New Orleans Feb. 7, 2013. The drill was a part of safety preparation for the support facility that included classroom time, leadership discussion and facility-wide drills. (U.S. Marine Corps photo by Cpl. Marcin Platek/Released) - Sgt. Alex Bolicke, training non-commissioned officer for Headquarters Battalion, Marine Forces Reserve acts as a gunman in an active-shooter drill held at the Marine Corps Support Facility New Orleans Feb. 7, 2013. The drill was a part of safety preparation for the support facility that included classroom time, leadership discussion and facility-wide drills. (U.S. Marine Corps photo by Cpl. Marcin Platek/Released)