Eielson tests Airmen on ATSO
Airman 1st Class Andrew O'Brien looks through his Airman's Manual for instructions on how to properly cordon off unexploded ordnances during a training evaluation Oct. 23, 2009, Eielson Air Force Base, Alaska. The evaluation tests the ability of Airmen on how to survive and operate in a chemical, biological, radiological, nuclear and high yield explosive environment. Airman O'Brien is assigned to the 354th Maintenance Squadron. (U.S. Air Force photo/Staff Sgt. Christopher Boitz)