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The Gulf of Tonkin incidents of 2 to 4 August 1964 have come to loom over the subsequent American engagement in Indochina. The incidents, principally the second one of 4 August, led to the approval of the Gulf of Tonkin Resolution by the U.S. Congress, which handed President Johnson the carte blanche charter he had wanted for future intervention in Southeast Asia. From this point on, the American policy and programs would dominate the course of the Indochina War. At the height of the American involvement, over a half million U.S. soldiers, sailors, airmen, and marines would be stationed there. The war would spread across the border into Cambodia and escalate in Laos. Thailand assumed a greater importance as a base for supporting the military effort, especially for the air war, but also for SIGINT purposes of intercept and direction finding.