Just discovered this nice ucronic series:
Axis of Time by John Birmingham.
Back in 1980, Kirk Douglas starred in a light SF movie called The Final Countdown in which the USS Nimitz was flung back in time to World War II, where the crew encountered the forces of Imperial Japan, and the dilemma was whether it was wise change their own history. John Birmingham -- who has apparently never seen the movie -- has the same basic premise for this work, but that is where the similarities end.
well, if you want to know more just read the rest.