Experience the American Journey through our country's visual heritage in this historical recording provided by the National Archives of the United States.ILLUSTRATES IMPORTANCE OF SURFACE AND UNDERGROUND COVER TO SURVIVE EFFECTS OF BLAST, HEAT, AND RADIATION; MEASURES TO PROTECT PERSONNEL, FOOD, AND WATER DURING BIOLOGICAL ATTACK; AND MEASURES TO PROTECT PERSONNEL EXPOSED TO A NERVE AGENT SPRAY ATTACK. From the Training Films from the Office of the Chief Signal Officer. This historical recording from the National Archives may contain variations in audio and video quality based on the limitations of the original source material.The content summary for this DVD is adapted from an historical description provided by the government agency or donor at the time of production release. This product is manufactured on demand using DVD-R recordable media. Amazon.com's standard return policy will apply.