I saw this film late one night on tv about 8 years ago now, and it was fantastic ! It's taken me ages to find it on dvd.
If you like your war stories with thoughtful characters, and a depth of what I can only assume to be realism (as I was not there) - then this is for you. A sort of early version of "Saints and Soldiers" but with much better acting and effects.....
Very little bad language, as the G.I's are all highly educated intel men and have chosen not to swear, but quite graphic in many other respects. The opening scene is pretty disturbing, and looks to be filmed on location somewhere extremely cold with loads of PROPER snow, not that usual Hollywood "salt" scattered everywhere.
William Wharton seems to be the man, the book "A Midnight Clear" is excellent, and don't forget, he wrote "Birdy", which has been favourably reviewed here on Amazon too.
Anyway, rent or buy "A Midnight Clear", I can almost guarantee you'll enjoy it.