What type of details about john heaphy fellowes  can be gathered from the following bio?  Bio: john heaphy `` jack '' fellowes -lrb- november 22 , 1932 -- may 3 , 2010 -rrb- was a u.s. navy captain , pilot , and prisoner of war -lrb- pow -rrb- during the vietnam war . he was known as `` happy jack '' because of his infectious sense of humor , which he maintained even while a pow . he was awarded the silver star for his `` conspicuous gallantry and intrepidity '' while a pow , credited with `` contributed significantly toward the eventual abandonment of harsh treatment by the north vietnamese '' .
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