Colorado Springs Police Department Officer J. W. Reutner dons a gas mask following a simulated chemical attack during the Coalition Warrior Interoperablity Demonstration June 16. The exercise, simulating a bomb and chemical attack in Colorado Springs, brought together members of U.S. Northern Command, the city of Colorado Springs and the University of Colorado at Colorado Springs first responders to respond to the exercise while simultaneously testing new technologies to make communicating between the groups more efficient.