Gas Chamber Marine Corps Lance Cpl. Jeffery Cambert disperses chlorobenzylidene malononitrile, or CS gas, in preparation for a gas mask training exercise at Marine Corps Air Station Futenma, Okinawa, Japan, Feb. 2. 2017. Marine Corps photo by Lance Cpl. Brooke A. Deiters SHARE: Download: Full Size (1.45 MB) Tags: Marines, Marine Corps Credit: Lance Cpl. Brooke Deiters VIRIN: 170202-M-MV819-0205.JPG Photo Gallery