I know there were a bunch of players affected by WWII, but I was looking at Mantle and comparing it to Ted Williams.
Look at the two years preceding WWII and the four years after Williams' service. It's not a stretch to say he would have gone over 3k hits, 2k runs and been somewhere between 625-650 HR's. Six straight years of leading the league in walks, OBP, SLG and stands to reason OPS. Add in 4 batting championships (the two years he didn't win, he batted .344 and .342).
For his career he had one season where his OPS was below 1.000.
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