from Revolver News:

During the Vietnam War, the U.S. was up against the ropes. Anti-war protests were growing louder, and our military was taking heavy losses. It was crunch time, and that’s when the U.S. government rolled out one of their wildest cards: “Operation Popeye.” What was it? A secret plan to turn the weather into a weapon to make it rain and flood out the Ho Chi Minh Trail — the Viet Cong’s main thoroughfare.