Air Force CV-22 Osprey crew chiefs assigned to the 352d Special Operations Maintenance Group perform pre-flight procedures during an ability to survive and operate exercise at RAF Mildenhall, England, Dec. 13, 2017. The ATSO and chemical, biological, radiological and nuclear exercise prepares Airmen for chemical warfare defenses. ( Air Force

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Keywords: 352d, america, armed, chief, crew, cv-22, defence, employee, exercise, federal, forces, government, group, maintainer, maintenance, mildenhall, military, operations, raf, service, special, states, united, usa