I was going to suggest Lee Marvin, then a quick Google finds that he actually turned the role down. Gene Hackman possibly.
But you're right; any actor wouldn't have played the role half so well. That thousand yard stare as he recounts his time in the water in WWII was as good a piece of acting as there ever has been.
Robert Shaw was a marvelous actor , one of the best. I wish he'd gotten to live longer then he did.
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