There would be a reason active duty Marines volunteered for security detail of a Army General.
In 2021, he said he had 15 more years before he could publish his memoirs.
He was a POW in N Vietnam.
His wife was retired military and he did not know what she did, but when she passed from cancer late May 2021 he was surprised that several Pentagon people showed for her funeral.
I suspect that her funeral was how his location was found by a hostile entity.