Wally SCHIRRA..one cool DUDE
When a faulty plug pulled out tooo soon on the rocket and the stack only rose a few inches and then shutdown the main engine, Wally had a split second to judge what the prob was and he guessed correct, otherwise, that would have been an abort off the pad. now, that's the right stuff and he went on the second try and had a perfect launch a few days later. BTW, one mission was treated as a Gemini mission and Wally's was treated as a Mercury Mission communcations wise!