Here's a fascinating attempt at dealing with unavoidable cross-cultural conflict: it's a US Army booklet from late 1945 called "112 Gripes about the French." It then lists typical complaints heard from GIs stationed in France, and debunks most of them. Great stuff. Go read it; you need to click on "Next Gripe" at the bottom of the page.
I've got a book called "Wartime Britain 1939-1945" by Juliet Gardiner, and it says that both the US army and British authorities issued similar guides for, respectively, American troops and British civilians, while the Americans were stationed over there.