Ammo Conservation
If there is a big group of enemy soliders, instead of using your guns throw a phosphrus grenade into the group.
Extreme Mode
Successfully complete the game on the hard difficulty setting to unlock the extreme difficulty setting.
Healing Falling Teammates
If one of your teammates falls to the ground, throw a smoke grenade near him. Then, get your health packet out and heal him.
Destroying Armored Vehicle or Tanks
Use Jones to run up to the vehicle or tank. Lay an anti-tank mine next to it, in turn sacrificing jones Temporarily to take out the vehicle or tank.
Use Jones to run close to the tank, then plant a C4. Throw a smoke grenade on the tank, run for the nearest cover, then blow it up.
Have one of your team members run by the tank to distract it. Then, run up to the tank, plant C4, and blow it up (risking your life). You can heal him with the other team member.
Unlock Cheat Menu
Go to the main menu then hit L1, L1, R1, R1, square, square, triangle, triangle, circle, circle. Now in the options menu while playing there will be a cheats option.
Destroy tanks in Street Battle
Get Bradley and Jones to kill the first few Iraquis. When you get to the first tank, there is a wrecked jeep. Crouch behind it,and switch to your laser desigenator. Lock on and a helicopter will destroy it. The second tank is behind a wall,there is a room off to the right go inside and get the rocket launcher leaning against a drawer. Get it,hit the deck and go outside. there is an alley strait in front of you. Get whoever doesn't have the rocket launcher and throw a grenade,preferebly smoke and throw it as a distraction. Make the other guy run into the alley and hit the tank from behind. The third tank is easy. Get into the room on the left. There will be a window. Use the laser designator and blow it up.