WHITEMAN AIR FORCE BASE, Mo. -- Staff Sgt. Cody Foreman, 509th Civil Engineer Squadron Chemical, Biological, Radiological and Nuclear instructor, helps Senior Airman Nathan Carns, 509th Maintenance Squadron low observable technician, fit his M-50 chemical mask during a CBRN training, Nov. 13. The M-50 chemical masked began replacing the MCU-2A/P chemical mask in 2009. (U.S. Air Force photo/Airman 1st Class Bryan Crane) (Released)