Col. Chris Collins (left), commander of the Nebraska Air National Guard’s 155th Air Refueling Wing Operations Group, and Maj. Bryan Scholtes, a wing plans officer, communicate in full chemical suits as they participate in an Ability to Survive and Operate exercise at the Nebraska National Guard air base in Lincoln, Neb., June 11, 2013. Members of the 155th ARW participated in the ATSO to evaluate and improve their capabilities and skills in a wartime scenario. (U.S. Air National Guard photo by Staff Sgt. James Lieth/Released)