The county of Liberty and town of Chester civil defense plan is approved. This plan provides for an integrated city-county organization for civil defense and for operations during periods of emergency, and thereby constitutes the most effective and efficient means of meeting the civil defense needs of the town and its citizens, by making maximum use of the existing agencies and capabilities of local government within Liberty County, supported by volunteers and nongovernmental personnel and resources, to prevent or minimize loss of life and property that could be caused by enemy attack or other catastrophe or disaster affecting the town. The mayor is authorized to approve such revisions of the civil defense plan as may be made, from time to time, if he deems the revisions to be reasonably necessary to meet the civil defense needs of the town and its citizens. (1969 Code §2.32.010)