Mercenaries is a game mode that mixes that requires team mates to be extremely careful with the teams points and not recklessly die in vain.
the objective of the game is for your team to get 2000 points.
each team starts with 1000 points. when you spawn you borrow 5 points from the team bank. when you kill someone you take all the points they have borrowed. at any point you can go back to base and give all points (except 5) to your team in exchange for Health, Ammo, and Grenades.
if your team has no more points to spend then you are unable to respawn until a teammate turns in points they get from killing enemies.
if a player Switches teams or leaves the server then all points on him will be given back to the team.
you can see how many points a player has on them if you look at the scoreboard. you may also point at a player to see the amount of points they have on them.
to prevent griefing, every time you die your spawn time will be increased until you go X amount of time without dying.