IIRC training was done in Britain and Scotland using similar beaches/cliffs.

Training was being carried out all over the place for all sorts of things. The ski industry as it is today in the western US was (in my opinion) heavily influenced by Camp Hale being constructed in the Colorado mountains specifically to train thousands of soldiers to fight in the Alps, using donkeys, skiing, mountain climbing, etc.

After the war the ski areas were developed with former soldiers.