Let's get the ASB parts out of the way and chalk it up to author fiat, since otherwise it ain't happening. Unmentionable Sea Mammal takes place and Germany conquers Britain. The government of Ireland rather understandably panics and asks the Americans if it could maybe send some nice young soldiers to help maintain order in Eire.
Is there any chance that, four or five years down the road, a successful US (plus Commonwealth/Free British and perhaps token Irish forces) invasion of the UK could be launched from Ireland? Would the Northwest (the coast north of Liverpool, perhaps) or (this seems less likely, but I'm far from an expert) the West Country be potential landing areas? Assume roughly equivalent circumstances to OTL - the Germans are still fighting in the East (forces lost to occupying Britain are balanced by not fighting the British in the Med, etc) and the Luftwaffe is outclassed by the Allied air forces. How does the Irish Sea compare to the Channel in terms of conditions?
What do the military men at home think?
Is there any chance that, four or five years down the road, a successful US (plus Commonwealth/Free British and perhaps token Irish forces) invasion of the UK could be launched from Ireland? Would the Northwest (the coast north of Liverpool, perhaps) or (this seems less likely, but I'm far from an expert) the West Country be potential landing areas? Assume roughly equivalent circumstances to OTL - the Germans are still fighting in the East (forces lost to occupying Britain are balanced by not fighting the British in the Med, etc) and the Luftwaffe is outclassed by the Allied air forces. How does the Irish Sea compare to the Channel in terms of conditions?
What do the military men at home think?