Not in the 1950s - that would have been the F-4 Phantom, and it was actually quite successful, in production from 1959 to 1979, and probably still flying (albeit totally hotrodded) by lots of air forces.<p>You might be thinking of the F-111, which was supposed to be all things to all services. That was the 1960s. Or maybe the failed A-12, which was supposed to be an attack plane for all services.<p>But you&#x27;re correct, unitary, multi-role fighters have a bad history.