1st Lieutenant John Burg, 11th Civil Engineer Squadron emergency management, updates the incident commander on current operation during exercise Black Flag at the Center for National Response in Gallagher W. Va, March 31. Members from the 79th Medical Wing, 11th Civil Engineer Squadron and Air Force District of Washington participate in five days of exercises each year to sharpen their chemical, radiological, nuclear or high-yield explosive readiness skills. (U.S. Air Force photo by Senior Airman Melissa V. Brownstein)