allow the Me262 to enter production on time in '42 before the P51D was able to be mass produced
Continued attacking RAF Airfield instead of city bombing, the RAF itself estimated it had about 6mo left until they switched bombing sites

Japan was defeated by the way its flag officers understood their honor code. They never instituted the convoy system and the different branches were unable to operate effectively together because the flag officers would lie about available resources

The war was won with US mass production, allowed by geography and technological limits of the day. The German Army was far better trained and capable then any it faced, its fatal flaw was a lack of logistical capacity.