I think that the biggest impact would be what dasreich proposed, the lack of amphibious experience for the allied forces when it came time to invade Europe. There would be the possibility that they could use Mediterranian bases to use as a jumping off point for landings along the Mediterranian. Southern France or through the Aegian Sea into the Balkans to threaten the flank of the Russian advance as the second front.

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PEOPLE SLEEP PEACEABLY IN THEIR BEDS AT NIGHT ONLY BECAUSE ROUGH MEN STAND READY TO DO VIOLENCE ON THEIR BEHALF. GEORGE ORWELL