During a simulation of a collapsed building a member of the Colorado Army National Guard's Chemical, Biological, Radiological, Nuclear or High-Yield Explosive Enhanced Response Force Package searches through the debris for missing and injured persons outside the Army Aviation Support Facility in Helena, Mont., Sept. 17. The National Guards of Montana, Colorado and several other state's participated in the three day exercise known as Vigilant Guard that was held to simulate a response to a major earthquake.