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Here is the link for information about the operation. If a firefight happened, Americans would have woken up in a "where the hell did this war come from" moment. I was only 2 at the time, I am not sure of these events were covered in the major news networks at the time or being carried out quietly. I would imagine there was considerable coverage of these events in the Korean press.
All it would have taken was an itchy trigger finger from a nervous Solider on either side of the DMZ, or real damage to MG Morris Brady's helicopter or person.