If you want a great reference on pronunciation, take the time to check out "The Big Lift", starring Montgomery Clift and Paul Douglas. It's about the Berlin Airlift, filmed in post-war Berlin (1949) and actual U.S. military personnel are used in the film, along with German nationals. There's a great scene where Paul Douglas recognizes a former guard from the Luftstalag in which he was interned.
The German used to torture Paul by making him learn German using difficult tongue twisters. If he pronounced it incorrectly, the guard beat him severely. Now the shoe was on the other foot. he gave the guard English lessons. He told the guard to say, "Which way does the whipperwill warrble?"
Paul tells him, "See, you krauts (no offense, it's part of the dialogue) have a habit of pronouncing your doubleyoos like vees. So, ya better not make that mistake cause I'll correct ya the same as ya did me, got it?"
Needless to say, Hans the guard didn't pass the class.
