180529-F-YM181-0001.JPG Photo By: Senior Airman Kevin Tanenbaum

JOINT BASE ANACOSTIA-BOLLING, Washington D.C. - U.S. Air Force Staff Sgt. Casey Leser, 11th Civil Engineer Squadron, performs a check of the gas mask drinking tube during a chemical, biological, radiological, and nuclear class portion of Prime BEEF training, or Base Engineer Emergency Force training, at Hangar 1 on Joint Base Anacostia-Bolling, June 17, 2021. The Prime BEEF training focuses on base sustainment and comprises joint training on defensive fighting positions with the 11th Security Forces Squadron as well as a CBRN course. (U.S. Air Force Photo by Senior Airman Kevin Tanenbaum)


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