Looking for gun squad survival horror recommendations

I just watched Ghosts of Mars last night and remember how much I liked watching these survival horrors that include a squad of people, usually some law enforcement group or something like that, but the one commonality these people all have together is that they have guns, and they are usually fighting for their lives to escape from some place, monster, or something else. Most of the ones I've seen could probably fit into the science fiction genre as well, but I'm open to any movies that include a group of people with guns fighting for their lives.

Anyway, the only survival horrors that I can think of that include a gun squad are Predator (Arnold and his group of buff special forces fighting against the Predator), Ghosts of Mars (a group of police officers who were doing a routine prisoner pickup for relocation and end up fighting for against an alien lifeform that possesses humans), Resident Evil (I remember a group of people with guns and stuff checking out the facility to see what happened and end up fighting zombies), and Doom (another group of special forces soldiers that were sent to some science facility to see what happened and end up fighting mutated humans).

Anyone have any recommendations that fit this bill? A group of people with guns fighting for their lives? Most of them seem pretty cut and dry with how the plot develops though. It seems everyone in the squad will die except maybe one or two that make it out alive.

Jam it back in, in the dark.

Well, I'm open to other movies that have this sort of feel to it as well, so if you want to recommend to me those other movies you had in mind, Lehah and Jason, I wouldn't mind taking a look at them too.

There's nowhere I can't reach.