Marines with India Company, 3rd Battalion, 3rd Marine Regiment, respond to a simulated improvised explosive device detonation during counter-IED training at Marine Corps Training Area Bellows, Hawaii, on April 26, 2011. The training was part of a two-week evolution that allowed Marines to learn and practically apply counter-IED techniques under the watchful eye of instructors from the Marine Corps Engineer Center of Excellence. During mounted and dismounted patrols, Marine Corps Engineer Center instructors introduced simulated IED explosions, small arms fire and casualty scenarios in order to guide Marines on how to mitigate the threat of IEDs and respond to their detonation.