ATSO Rodeo
Tech. Sgt. Devin Street, a member of the 931st Maintenance Squadron, McConnell Air Force Base, Kan., practices donning his gas mask during the 931st Air Refueling Group's Ability to Survive and Operate (ATSO) Rodeo, April 7, 2013. More than 100 members of the 931 ARG participated in the event. (U.S. Air Force photo by 1st Lt. Zach Anderson)