A U.S. Soldier with the 131st Engineer Company uses a Skid Steer to dig out vehicle fighting positions from a burm, to provide a solid defense for the brigade command post against mock apposing forces during exercise Decisive Action Training Environment 14-08, at Fort Polk, La., June 21, 2014. Decisive Action Training Environment links live-fire pre-deployment training with virtual training and constructive training at operation centers. Participants at the National Training Center are supported by units at other locations.