Anyone know this game? Please help me!

A long time ago, I played a game with my friend.
It was a really long time ago, so I can't remember the name of the game.
I can only remember one level from it though.
It included a large minefield and a big sci-fi base with a big door.
Once I reached the door, a lot of enemies came out, and I had to use a trap door in order to get in.
Is it possible if anyone knows the name of the game?
EDIT: I know the game is FPS, and that's all :S (and you shoot soldiers, with guns. I can't really remember, sci-fi soldiers, and i think... maybe someone is talking to you using a radio, a friend)