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CBR Defense practice.
Naval Base Ventura County, Calif. (Feb. 10, 2003) -- Seabees assigned to Naval Mobile Construction Battalion Forty (NMCB-40) practice changing out air filter canisters to ensure proper seal and maximum protection. NMCB-40 is home-ported at Naval Base Ventura County and is currently conducting various training exercises to include Chemical, Biological, Radiological (CBR) warfare scenarios. U.S. Navy photo by Photographer's Mate Airman Lamel J. Hinton. (RELEASED)

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