Well, this goes two ways. To be sure, there were some really good advantages of developing a fighter bomber to be sure. But if the Messerchmit (sp?) had been unleashed in 1942, it would have seriously hampered the abillity of Allied Bombers to get anywhere near their target. According to Bomber crews, those Jets were too fast for the gun turret crews to shoot down onboard Flying Fortresses. As such, there would have been a HUGE disparity of bombers going down over the Atlantic and over Western Europe. To me, though, it was stopping those German agents in 1943 in Eastern Europe who were carrying some of the ingredients they needed for atomic research that really settled the war. If not, it was possible by 1944 or early 45 to have an a bomb ready. Hitler could have strapped the a-bomb onto a V-2 Missle and launched it at London, and wiped it off the planet. The war at that point was all but over, but he by god would have killed Churchill and most of London in the process.