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WASHINGTON, July 2—The United States has been secretly seeding clouds over North Vi etnam, Laos and South Viet nam to increase and control the rainfall for military purposes.
Government sources, both ci vilian and military, said during an extensive series of inter views that the Air Force cloud seeding program has been aimed most recently at hinder ing movement of North Viet namese troops and equipment and suppressing enemy antiair craft missile fire.
The disclosure confirmed growing speculation in Con gressional and scientific circles about the use of weather mod ification in Southeast Asia. De spite years of experiments with rainmaking in the United States and elsewhere, scientists are not sure they understand its long‐term effect on the ecology of a region.
https://www.nytimes.com/1972/07/03/archives/rainmaking-is-used-as-weapon-by-us-cloudseeding-in-indochina-is.html
https://www.congress.gov/bill/107th-congress/house-bill/2977/text/ih