President Johnson … expressed concerns over the number of aircraft being lost on Rolling Thunder missions. Between January and September 1966, a total of228 fixed-wing combat and support aircraft had been lost during missions against North Vietnam. The question in Washington was, did the enemy have prior warning of U.S. raids against North Vietnam? … The answer was yes, they did.
Stephen J. Kelley in PURPLE DRAGON: The Origin and Development of the United States OPSEC Program
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