Vigilance
Staff Sgt. Willie McElroy, 96th Aerospace Medicine Squadron, updates the M8 chemical detection paper during a chemical, biological, radiological, nuclear and explosive training exercise at Eglin Air Force Base, Fla., Oct. 24. The Airmen were taught the proper procedures during the week-long event before executing the tactics by themselves during the exercise. (U.S. Air Force photo/Samuel King Jr.)