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CBR (Chemical, Biological, Radiological) Decontamination Unit 1974 US Army TF3-4899 National Archives and Records Administration - ARC Identifier 2580550 / Local Identifier 175.47 - Chemical, Biological, Radiological (CBR) Decontamination Unit - Department of Defense. Department of the Army. U.S. Army Materiel Command. U.S. Army Munitions Command. Edgewood Arsenal. (08/01/1962 - 1971). The United states Army Presents TF3-4899 - 1974 This film warned that decontamination of vehicles and persons were vitally important after a chemical, biological, or radiological attack. After an attack, units should have marked contaminated areas with approved signs indicating the time, date, and agent used. The four methods of decontamination were natural, removing, covering, and destroying. The first method, natural decontamination, was the easiest of all the methods for removing biological and chemical agents. Wind, evaporation, rain, sunlight and aging all decay biological, chemical, and radiactive material from fallout.