OPERATION POPEYE

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http://en.wikipedia.org/wiki/Operation_Popeye

Operation Popeye was a cloud seeding operation over Vietnam during the Vietnam War. The goal of this project was to make monsoon season last 30-50 days longer than normal and to
  • Create landslides on the sides of roads
  • Soften road surfaces
  • Wash out river crossings
  • Maintain Saturated soil conditions longer than normal
The program was operational from March of 1967 to July of 1972.