Kein Bund für's Leben (2007)

The movie deals with a guy who gets to join the German Bundeswehr involuntarily because a colleague loses his denial papers in order to get the chance to get down on his girlfriend. When entering the Bundeswehr he acts like a giant idiot and of course gets in one room with some of the biggest losers around. The loser turns out to be a hero and leads his loser-colleagues to win a contest with the local US army squad.