A recently-unearthed U.S. Navy research project calls for creating mad-made floods and droughts to "disrupt (the) economy" of an enemy state.
"Weather modification was used successfully in Viet Nam to (among other things) hinder and impede the movement of personnel and material from North Viet Nam to South Viet Nam," notes a Naval Air Warfare Weapons Division - China Lake research proposal, released last month through the Freedom of Information Act. But "since that time military research on Weather Modification has dwindled in the United States."
The proposal suggests a study of the latest weather manipulation techniques, to "give the U.S. military a viable, state-of-the-art weather modification capability again." With that in hand, American forces would be able...
To impede or deny the movement of personnel and material because of rains-floods, snow-blizzards, etc.
(2) To disrupt economy due to the effect of floods, droughts, etc.
The proposal is undated. But it's pretty clearly from the Cold War. Not only is "the Soviet Union (Russia)" mentioned. The money is also relatively small, by today's standards -- less than a half-million dollars, over two years.
http://blog.wired.com/defense/2008/02/navy-research-p.htmlSource for the Vietnam claim:
http://www.boston.com/news/globe/ideas/articles/2005/07/03/dont_like_the_weather_change_it/Source for the Navy project:
http://cryptome.org/weather-war.pdf