This technology has been around since the 60's and was used before the Vietnam war, as well as during the Vietnam War makes this non-news.
Do a little research and you will find out that during the Apollo moon mission that Army Intelligence at Ft Hood jammed a frequency outside of the listed bands. Apparently they were field testing high powered multi-frequency jammers before being deployed into Vietnam. The field manual was very light and they were instructed to avoid certain bands that were coded red. It turned out to be a private frequency for NASA, which caused a two minute loss of communication with the Apollo team. The reason they knew about the Apollo comm link was two truckloads of intelligence spooks arrive at the site of their outpost. They were interviewed and informed that they had inadvertently knocked Houston's comms down and caused a two minute panic because the primary frequency and the backup frequency were unavailable for communication with the Apollo astronauts.
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