Getting eliminated sets your streak back to zero. Modern Warfare II additionally offers the choice to use a Scorestreak system instead, using earned score instead of eliminations to track your progress. Again, when eliminated, your Scorestreak progress is reset to zero. Only one Killstreak/Scorestreak within the same category (requiring the same number of eliminations or score) can be selected.
UAV recon ship that reveals enemy locations on the minimap
A remote-controlled drone with an attached C4 charge.
Unlocked: Level 18
A drone that scrambles all enemy minimaps.
Unlocked: Level 6
Throw a device that launches a cluster of smaller mines within the immediate area.
Unlocked: Level 9
Call in a random killstreak care package to your location.
Unlocked: Level 13
Call in twin jets for a precision strike along the best available path.
Unlocked: Level 22
Control a long range cruise missile with boost capabilities.
Signal several waves of mortars to attack a location.
An automated turret that scans for nearby enemies, and fires incendiary based rounds.
Unlocked: Level 26
Call in a trio of jets to release aerial explosives onto specified targets.
Releases a pair of precision bombs before circling back and guarding a location of the player’s choice.
Unlocked: Level 35
An escort helo that will watch over your position, and ping nearby enemy locations before engaging them.
Unlocked: Level 40
Remote controlled amphibious vehicle with auto sentry capabilities.
Unlocked: Level 32
Call in a bomber that releases a large line of explosives along its path.
Unlocked: Level 53
Control an assault chopper armed with a turret and air-to-land missiles.
Unlocked: Level 27
Call in 3 random killstreak care packages to your location.
Unlocked: Level 42
A heavy assault gunship equipped with a laser tracking missile, along with the standard 40mm and 25mm cannons.
Unlocked: Level 48
An untargetable orbital UAV that reveals the enemy’s direction on the minimap in real time.
Unlocked: Level 51
Juggernaut assault gear delivered by care package. The minigun will drop when the Juggernaut dies.
Unlocked: Level 55
Mass Guided Bombs (Nuke)
Call in a game-ending nuke and take the win. 5 Guided missiles spread out across the map.
Kills: 30 consecutive gun kills