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Some tips for all stages:
- Difficulty does not matter, so you're better off playing on easy.
- Use cover! Most of the environment is indestructible, everything from airplane parts to wood crates, use that to your advantage, and heal when you've taken some damage.
- Take it slow! In most parts of the game (if not all - there's at least one spot I'm just not sure of), there is a set number of enemies, no unlimited spawning like Black Ops, so there's no pressure to make it up to a certain area. Take your time and pick guys off from a distance. Your team will usually run ahead of you when an area has been cleared. Whey they get to the next area, they may take out a few of the enemies or, at the very least, help show you where the enemies are ... BUT ...
- Your team AI isn't always great. Enemies will sometimes run right by them and come after you. Your team can't be killed, which is a huge plus, but always stay on your toes!
- Watch out for the grenade indicator. There isn't a 'throw back' option like in other games, so your only choice is to get out of there!

Possible Issues with Stage 2: (minor spoilers)

- In this stage we fight the sentry guns we caught a glimpse of during the opening bus ride. There are 3 parts of the level that require you to take down sentry guns, just be careful moving from cover to cover. Watch where the beam is aiming and once it passes you move to your next spot. A grenade to the back of the gun (because they run on propane?!) and the sentry is history.

- I did die once while going for this achievement and had to start over ... there is a part in the level where you face an ambush, and you fight for several seconds in slow motion. The moment I came out of slo-mo is when I got wasted by a guy with a machine gun. While you are still IN slo-mo, get over to the left as far as you can so when slo-mo ends you can make a quick escape up the stairs.