"What is this movie?" - thread

I thought I'd make a thread for this. Often we remember a movie, except what's it called and who's in it. Let's find movies for each other here.



I'll start. It's made in 80's or late 70's, probably 80's. There's a war or just soldiers having drills. Some soldiers get lost in swampy woods. They start getting killed one by one, usually by traps. Possibly made by hunters/poachers.



I can't remember the title at all. I can't remember the actors' names. I can't find it. Help me and you shall be rewarded with absolutely nothing!