Das Boot has been one of my favorite films since I saw it in German class in 1983. I had the Director's Cut on VHS for years, then got the Extended Edition on DVD, and watch it a couple of times a year. The German-language edition is best, of course, but I have to say, the English-language dubbing is one of the best dub-jobs in the history of film. It helps that every actor involved in the film spoke English as well as German, and dubbed his own dialogue.
Tanks only play a peripheral part in
Full Metal Jacket, since Hue was an infantry operation. One thing I think we definitely need to bring back is the infantry-access telephone mounted on our tanks. You can see one of the characters using the phone to direct the tankers' fire. They eliminated it from the design of the M1 Abrams, since the new generation of tanks was supposed to be accompanied by mounted infantry, instead of foot-soldiers. Subsequent operations using the M1 have shown that an infantry-access phone would be very helpful in infantry-armor operations. For one thing, it would keep the radio net clear of unnecessary traffic.