U.S. National Guardsmen from the Utah National Guard,

U.S. National Guardsmen from the Utah National Guard, 85th Civil Support Team prepare to enter the Pepsi Center in Denver in response to a chemical spill resulting from a simulated train derailment July 25, 2013. This training is a part of the Vigilant Guard exercise being held this week in the Denver metro and Colorado Springs area. Vigilant Guard is a multi-state multi-agency emergency response exercise focused on interagency coordination to prepare for domestic emergencies and catastrophic events. (U.S. Air National Guard photo by Staff Sgt. Nicole Manzanares/RELEASED)