Having watched the POW/MIA hearings rather closely, I'd say he very well might have. During those hearings, his purpose was clearly to suppress evidence rather than gather as much evidence as possible to evaluate.
I think his behavior as a senator on this issue has been despicable and probably very self-serving.
Bingo.
Enough with the damn secrets already.
Especially those decades old, only relevant because old cronies, still in power, can't stand to have their dirty laundry aired.