Depending on who’s talking, the North American F-107A was either the best fighter the Air Force didn’t have the sense to buy, or a politically flawed loser from the outset. The F-107A will be remembered forever, if it is remembered at all, for being configured as no jet had been before or since: the sharp-edged maw of its air intake, feeding a prototype Pratt & Whitney YJ-75 engine, was just above and behind the cockpit, giving the otherwise sleek fighter the look of a fourth grader with an oversize backpack. In an era of dart-like Mirages and Delta Daggers, the...