Marines from Marine Wing Support Squadron (MWSS) 272 conduct gas chamber training aboard Camp Geiger as part of their chemical, biological, radiological and nuclear (CBRN) environment training, Feb 6. This training was part of a six-day squadron-wide field exercise (FEX) Feb.5-10.(U.S. Marine Corps photo by Lance Cpl. Andy J. Orozco/Released) - Marines from Marine Wing Support Squadron (MWSS) 272 conduct gas chamber training aboard Camp Geiger as part of their chemical, biological, radiological and nuclear (CBRN) environment training, Feb 6. This training was part of a six-day squadron-wide field exercise (FEX) Feb.5-10.(U.S. Marine Corps photo by Lance Cpl. Andy J. Orozco/Released)