The Great Escape - technically inaccurate but really captures the spirit of a time when the west could actually be proud of having a spine.
Fan of Dam Busters - unlikely it'll ever be re-made accurately given the actual radio code word for a successful bombing run...
Since nobody has mentioned it - 'Ice cold in Alex' - Anthony Quayle's accent is inconsistent but it's a solid film.
Der Untergang (Downfall in English) - chilling performance by Bruno Ganz as Hitler in his final days in Berlin. Probably more people world wide know of it, or have seen some of it due to a particular scene where he goes on a big rant having become an internet meme with various subtitle replacements for comedic effect.
Tora Tora Tora - epic production and very well handled by those who filmed both sides
The 1993 German film 'Stalingrad' (there's a couple of russian films of the same name I haven't seen)
Idi i smotri (Come and see) - Has to be considered something akin to a Russian ww2 film that reminds one of Apocalypse Now - not perfect but really out there.
