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I agree it was TFR related. I heard it happened like this. The Viets on the Ho Chi Minh trail shot everything but the last coconut up 500 feet into the path of an oncoming F-111 to confuse the TFR. The F-111 TFR system reacted to the blitz of bicycles, trash, and coconuts (?) by pulling up (horizontal stabilizers fully engaged) and stalling out.

I heard there were two instances of this, but am unsure if three planes were lost. I think the ruskies got one and we recovered the other. The problem got fixed and we did not lose another as far as I know.

By the time I got to work with GD at Fort Worth, we were dealing with wing box cracks at the pivot points. This to me, was a very likely candidate too. The pivot bearing boss was totally compromised in some x-rays I saw.

I think most pilot types disliked the TFR concept initially and it took quite a few rides for them to get confident in the viability and reliability of the system. Later on, they wouldn't fly without it.