1972 65438+2 10 China * * When the Central Committee forwarded the State Council's report on the grain problem on 10, it conveyed Mao Zedong's instructions of "digging deep holes, accumulating grain extensively and not seeking hegemony". Since the mid-1960s, due to overestimation of the international situation, Mao Zedong emphasized the importance of preparing for war, preparing food and cloth, digging air-raid shelters and repairing fortifications. According to these spirits, in August of 1969, the central government formally decided to set up a national leading group for civil air defense, and all provinces, municipalities and autonomous regions also set up leading groups for civil air defense at all levels, and carried out mass activities of digging air-raid shelters and trenches throughout the country. Therefore, the scale of civil air defense projects has expanded rapidly on the existing basis, and the specifications of civil air defense projects have been continuously improved.