Call Of Duty 2: Big Red One

Level select:
Hold L + R and press Up(2), Down(2), Left(2), Right(2), X, Right, X, Right, X at the chapter selection screen.

Invincibility:
Hold L + R and press Y, X, B, A, Y, X, B, A at the chapter selection screen.

Characters:
Win the indicated battle on the map to unlock the corresponding characters.

Oran: Bloomfield
Oran: Denley
Oran: Hawkins
Oran: Kelly

Concept art:
Win the indicated battle on the map to unlock the corresponding artwork.

Oran: Oran 1
Oran: Oran 2

Movies:
Win the indicated battle on the map to unlock the corresponding movie.

Operation Torch
Operation Husky
Operation Overlord

Vehicles:
Win the indicated battle on the map to unlock the corresponding vehicle.

Oran: Ju-87 Stuka
Oran: M3 Sturart light tank
Oran: M3A1 Halftrack
Oran: Quad 20 mm Flakvierling
Oran: Supermarine Spitfire

Weapons:
Win the indicated battle on the map to unlock the corresponding weapon.
fbwr, m espbt bysi.

Oran: Chatellerault
Oran: Hatchkiss
Oran: Karabiner 98k Bolt Action
Oran: M1 Garand
Oran: M2.50 cal Browning
Oran: MAS 36
Oran: MAS 38
Oran: MK 2 Grenade
Oran: Stielhandgrenate
Oran: Thompson

Hint: Counterattack mission:
When Brooklyn says "Finally, this crappy mud pit is ours!", just start running away from where you came. Equip a BAR or another MG while running. You will not have to worry about the tank dealing damage and can concentrate about the Nazis on your way.
Dan Grohs.

After the tank chases you and blows down the main bridge, run to the right to find a bazooka.
chainsawman2012.

Hint: Africa tank mission:
In the first tank mission in Africa, there is a Flak 88 gun that will take out one of your tanks. The gun is on the right side inside a building and is not visible. Shoot the second building on the right side. It is the tallest one and will start to crumble when hit. Also, some of your troops are on the right side. Do no run them over. They will help you by taking out the other Flak 88 gun. All you have to do is take out the two machine gunners on the right side after the first Flak 88 gun.
N69.

When you get past the two 88s you will have to go through Panzers. To avoid losing health, stay behind the building but get slightly closer so that you can see the Panzer. When you shoot at the side, the other tanks will help you take it out. Do the same thing with the second one and blow up all the trucks you see.
Dukadoo9.

In the first Africa tank mission, you will arrive at the depot and meet two tanks. Then, you will meet four more closer to where the buildings are located. The four tanks take out a lot of your other tanks. If you want to keep them alive, try to pass them in the turn and head in first, but make sure you have full health. Try to take out at least two, then the others will take care of the rest.
Nathan Napier.

Hint: Bomber mission:
In the bomber mission, at the end it will allow you to choose any machine gun turret to defend the plane from. It is recommended, at least under the hard difficulty setting, that you stay at the back turret. It takes too long to get to the front, and your plane may get shot down.
N69.

Hint: Second to last mission:
In the second to last mission, after you finish clearing out houses of enemies, your tank will get ambushed by a Flak 88 gun and a mortar crew. You must first defend your position. Move into the shack building on the right side and move into the top right corner of the building. Watch out for enemies in the top of the building to your left. Once you have taken out all those enemies, focus on the enemies near the tank. Once you repel the assault, you and another soldier must take out the mortar crew. Follow the other soldier and keep your M1 Carbine out. When you get near the center of the town, duck behind the brick wall and pick off the two mortar men in the building in front of you. Then, charge up the steps towards the Flak 88 gun. If you sit behind the wall for too long, the Flak 88 gun will get you. Use your Thompson to take out the two men manning the Flak 88 gun, then plant the explosive charge. Run for cover towards the shack that you were defending earlier. Do not worry about the machine gun in the window; the Flak 88 will provide you with enough cover.
N69..

Hint: Last mission:
When you are going thought the dragon's teeth, take out the machine gunner and his friend in the middle tower. Then, make a run half way thought the dragon's teeth. Next, go prone behind a tooth. Take out the enemies around you and in the tower. Then, get up and run all the way through and underneath the last tower for cover. Wait for your squad to arrive, then storm up the hill and go into the bunker.

Hint: Machine guns:
When manning a machine gun, a short six or seven round burst works best against enemies. If a lot of enemies get close, lie prone and throw a grenade at them. Then, quickly get back on the machine gun.
N69.

Hint: Saving ammunition:
Get a bolt-action rifle (with five shots) without a scope. Zoom in and shoot at the upper torso and higher. It should only require one round to kill them. This works well if you cannot get a good shot.
Steve York.

When you have a machine gun, do not waste the ammo on two or three targets. Use it when you are facing a large number of enemies. Use the rifle first. Try to pick up ammo from the Americans who have died. For example, there sometimes is a solider who is not part of your squad. Stay with him, and when he dies take his ammo.
Dukadoo9.

Hint: Avoiding more attacks:
Sometimes enemies will just keep coming unless you move up. Keep moving forward to cover when you are not under fire.
N69.

Hint: Staying alive:
The best way to stay alive is to crouch down, but do not lay down. Find good cover, and any chance you have, get a machine gun or a semi machine gun. When you are crouched down, remain that way. It makes you a smaller target and it does not affect how fast you run. Also, the health packs are not very rare, but you still have to look for them. If there is a room that you do not have to go into, you may as well look in it regardless.
flaM.

Hint: Replacement sniper rifle:
If you do not have a Springfield sniper rifle, the M1 Garrand also works well. Pick up an M1 and as much ammo as you can for it. When you reach a location where your squad moves forward and enemies are all over, stay slightly farther back from your squad. Crouch behind cover. Equip the M1 and hold L. You can shoot people from a good distance away. Hit the, in the head down to the stomach and it should be a one hit kill. This is very useful when there is a large amount of enemies in an area.
jay hunt.