Multiplayer

Modern Warfare 2's multiplayer mode has Killstreaks and Deathstreaks to help both the experienced players as well as the newcomers.

Killstreaks are meant to help the experienced users and give them something to aim for. You can choose a maxium of three different killstreaks in your loadout. When you reach a set amount of kills without dying you can use one of the following killstreaks.
Deathstreaks are meant for those that are not experienced at all, newcomers or players with plain bad luck. These deathstreaks are activated when you die a set amount of times without making a kill yourself.
Kills obtained via a Killstreak Reward count towards your next killstreak UNLESS it's obtained through a care package.

Killstreaks		Description	Deathstreaks		Description
	3 kills	UAV Shows enemies on the minimap Deploys a UAV to scan the map and reveal enemy locations. enemies with coldblooded perk will not be revealed		3 deaths	Copycat Steal your killer's class in killcam. Copy the loadout of the enemy that killed you on your fourth death.
	4 kills	Care Package Airdrop a random killstreak or ammo Deploys by throwing a red smoke grenade. The care package can be picked up by anyone once it hits the ground, including the enemy team.		4 deaths	Painkiller (lvl 6) Big health boost when you spawn. Triple health for ten seconds after respawn.
	4 kills	Counter-UAV Temporarily disables enemy radar Blocks an enemy UAV		4 deaths	Martyrdom (lvl 27) Drop a live grenade just after dying. The cooked grenade explodes after one second.
	5 kills	Sentry Gun Airdrop a placeable Sentry gun The Sentry Gun automatically fires at enemies in its line of sight, but it can be destroyed by enemy fire.		4 deaths	Final Stand (lvl 39) Get back up after being wounded. Last Stand, but you will be able to use your primary weapon and fully recover after 10 seconds without being shot again.
	5 kills	Predator Missile Remote control missile Fires a controllable missile via laptop at a designated target area, can be boosted by holding RT. However, the user is defenseless while controlling the missile.
	6 kills	Precision Air Strike Call in a directional airstrike Initiates an airstrike on a targeted area the user can now control the direction the airstrike comes from.
	7 kills	Harrier Strike Airstrike witha hovering Harrier. Two harriers will fly over to drop a small carpet of bombs. The third harrier will fly over and hover the area. It will kill with a board cannon (no bombs or missiles).
	7 kills	Attack Helicopter Call in a support helicopter Deploys a helicopter to attack enemy players
	8 kills	Emergency Airdrop Airdrop 4 random killstreaks or ammo An airplane will drop 4 "care packages" with a higher chance of dropping better killstreaks. It's complete random though.
	9 kills	Pave Low Heavy armored assault helicopter Deploys a more heavily armored attack helicopter that can deply two anti-missile flares.
	9 kills	Stealth Bomber Airstrike undetectable on enemy maps A B2 bomber plane with a very large carpet of bombs
	11 kills	Chopper Gunner Be the gunner of a chopper Deploys an chopper that the player controls via laptop. However, the user is defenseless while commanding the chopper.
	11 kills	AC-130 Be the gunner of an AC-130 Deploys an AC-130 plane. You can control the 105mm, 40mm and 25mm cannon. However, you're defenseless while commanding the plane.
	15 kills	EMP Temporarily disables enemy electronics. Call in a Electromagnetic pulse bomb to disable all electronics. Crashing helicopters and airplanes, disabling sentry guns and red dot or holographic sights.
	25 kills	Tactical Nuke End the game with a bang. Call in a tactical nuke to end the game (and win it, even if you were losing).

Multiplayer

Killstreaks

Deathstreaks

UAV

Copycat

Care Package

Painkiller (lvl 6)

Counter-UAV

Martyrdom (lvl 27)

Sentry Gun

Final Stand (lvl 39)

Predator Missile

Precision Air Strike

Harrier Strike

Attack Helicopter

Emergency Airdrop

Pave Low

Stealth Bomber

Chopper Gunner

AC-130

EMP

Tactical Nuke