So many Modern Warfare 3 players get killed because they run everywhere without considering the consequences. The worst thing you can do is run around a corner or into a building with no knowledge of who is lying in wait for you.

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Notice that I still run around a lot, but take a few seconds to raise our sights and use caution before approaching corners and choke points. Speed and care are everything in Call of Duty, and a few seconds of being cautious isn't going to slow you down too much. Be disciplined.

Taking the time to stop your sprint and walk around corners and inside buildings will give you a second or two to properly survey the landscape and see if enemies are waiting to spring an ambush.

Like the above tip this will extend your life expectancy dramatically. Stop your sprint before approaching a corner and raise your weapon as you walk slowly.

Chances are someone on the opposing team is blindly sprinting towards the same corner, and you will kill them purely because you had your weapon up first. In the time it takes them to raise their gun and fire back, theyll already be dead.

You are at your most vulnerable when youre reloading. You cant do anything once you hit reload, so its possibly the worst thing you can do in the middle of a fight.
Notice the way you move, shoot and reload in the video above.
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If I were shooting at enemies, we'd always, always walk back to cover to reload before attempting to move back into the open to fire more rounds. If possible, hide behind something low, like a dumpster or defensive wall.

Never, ever just throw a grenade with a full timer. This gives your target far too much time to notice the grenade on their HUD and escape before it detonates. Holding it for just a second longer will increase your chances.
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Its all too tempting to simply hold down the trigger and volley off a barrage of bullets in the hope that you kill your target. This is potentially suicidal. For one, if you dont have a suppressor attached, you will give your position away on the radar when firing.

The recoil changes between fully-automatic fire and iron sights burst fire. We've also fired at a wall in both modes so you can see the range of bullet spread between styles. Always go iron sights where possible, and use controlled bursts.

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Recon is a Tier 1 Perk available at Rank 4. It brings up an enemy's location and direction he's facing on the mini-map after you injure him with explosives. Flash and Concussion Grenades count as explosives.
Pro
The Pro Version of Recon puts any enemy you shoot on the mini-map.

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Sleight of Hand is a Tier 1 Perk available at Rank 4. It allows you to reload weapons faster.
Pro
The Pro Version of Sleight of Hand allows you to swap between your primary and secondary weapons faster.

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Blind Eye is a Tier 1 Perk available at Rank 11. It makes you undetectable by Air Support and Sentries. That includes:

AC-130
AH-6 Overwatch
Assault Drone
Attack Helicopter
I.M.S.
Osprey Gunner
Pave Low
Predator Missile
Reaper
Recon Drone
Remote Sentry
Sentry Gun
Some of those killstreaks are human controlled, so you may still be killed by them. The only difference is you won't have a red box around you for easy detection.
Pro
The Pro Version of Blind Eye allows you to lock on with your Launchers quicker than normal. Instead of the Launcher beeping three times and locking-on, it beeps one time and locks-on. Bullet Damage to Air Support and Sentries is also increased.

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Extreme Conditioning is a Tier 1 Perk available at Rank 22. It allows you to run about twice as long as usual.
Pro
The Pro version of Extreme Conditioning allows you to climb over obstacles faster.

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Scavenger is a Tier 1 Perk available at Rank 39. It allows you to resupply ammo from dead enemies by picking up small blue bags on the battlefield. Each bag will resupply one magazine of ammunition and a Throwing Knife, if you have that Lethal Equipment selected.
Pro
The Pro version of Scavenger gives you extra ammunition from the start of your life.

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Quickdraw is a Tier 2 Perk available at Rank 4. It allows you to aim down your weapon's sights faster than normal.
Pro
The Pro Version of Quickdraw allows you to recover from Equipment usage faster. Throw a grenade, or set down any other piece of equipment, and your weapon will come up faster than usual.

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Blast Shield is a Tier 2 perk available at Rank 4. It reduces the Explosive Damage you take.
Pro
The Pro version of Blast Shield allows you to slightly resist Flash Grenades and Concussion Grenades.

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Hardline is a Tier 2 Perk available at Rank 15. It allow s you to earn your Pointstreak in one less point.
Pro
The Pro version of Hardline makes it so every two assists count as a point towards your Pointstreak. Hardline Pro also allows you to use Deathstreaks in one less death.

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Assassin is a Tier 2 perk available at Rank 27. It makes you undetectable by UAV, Advanced UAV, Portable Radar, Thermal, and Heartbeat Sensors. However, you will come up on the two UAVs if you fire your weapon without a Silencer
Pro
The Pro Version of Assassin makes you immune to Counter UAV and EMP. In addition to that, enemies will not have a red crosshair or name above your head when looking at you.

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Overkill is a Tier 2 Perk available at Rank 47. It allows you to carry two primary weapons instead of one primary and one secondary weapon.
Pro
The pro version of overkill allows you to place an attachment on your second primary weapon.

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Marksman is a Tier 3 Perk available at Rank 4. It allows you to identify enemy targets at longer distances. The red name above their head is how you identify targets.
Pro
The Pro Version of Marksman allows you to hold your breath almost three times longer than usual.

[img]http://oyster.ignimgs.com/mediawiki/wiki-api.ign.com/call-of-duty-modern-warfare-3/c/cd/PerStalker is a Tier 3 Perk available at Rank 4. It allows you to move faster while aiming down your weapon's sights.
Pro
The Pro Version of Stalker delays enemy Claymore and Bouncing Betty explosions.k_stalker.png[/img]

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Sitrep is a Tier 3 Perk available at Rank 19. It allows you to detect enemy devices by highlighting them as red. Devices include:

Scrambler
Trophy System
Tactical Insertion
Portable Radar
Bouncing Betty
Claymore
C4
Airdrop Trap
I.M.S.
Pro
Sitrep Pro allows you to hear enemy footsteps louder.

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Steady Aim is a Tier 3 perk available at Rank 30. It allows you to fire more accurately when not aiming down your weapon's sights. When you're firing from the hip, you will be given a set of crosshairs. All bullets will fire within that set of crosshairs. These crosshairs will expand when you fire in succession or move. Steady Aim keeps the crosshairs smaller than usual.
Pro
The Pro version of Steady Aim allows you to bring up your weapon faster after sprinting.

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Dead Silence is a Tier 3 Perk available at Rank 55. It allows you to move around quietly.
Pro
The Pro version of Dead Silence makes you immune to fall damage. Jump off the highest building in the world and don't get a scratch.