Attack Helicopter

The Attack Helicopter is a killstreak Reward in Call of Duty: Modern Warfare 2 and Call of Duty: Black Ops. It replaces the Helicopter from Call of Duty 4: Modern Warfare.

Call of Duty: Modern Warfare 2
The Attack Helicopter returns as a 7-kill streak reward and is identical to its Call of Duty 4 counterpart in appearance. It is generally less effective than its Call of Duty 4 counter-part, mainly due to the Cold Blooded perk. In Modern Warfare 2, the Harrier Strike, another 7-kill streak reward, is used more often than the Attack Helicopter, as it features a 2-round airstrike (w/o direction, unlike the Precision Airstrike),

followed by a hovering Harrier. It appears to fire FMJ rounds, as evidenced by the sound it makes when the bullets impact. The Attack Helicopter's (as well as the Harrier) main weakness is its lack of flares. A single Javelin, Stinger missile (or two AT4, RPG-7 missiles) will bring it down, as well as a single Predator Missile. It will also linger around for a little longer than its Call of Duty 4 counterpart. Task Force 141, Rangers, and SEALs use the AH-1W(4B) Super Cobra. Militia, OpFor, and Spetsnaz use the Mi-24 Hind.

This killstreak can be very effective on maps that have a lot of buildings such as Invasion and Karachi as the attack helicopter moves a lot around the map, meaning it is quite hard sometimes when players armed with Stinger or Javelin missiles try to take them down. However, the helicopter is unlikely to kill anyone as they will most likely be inside, and it is not that hard to destroy as it can be shot before it can even get in the map, and it doesn't move that fast.

Call of Duty: Black Ops
In the multiplayer reveal for Call of Duty: Black Ops, the Attack Helicopter was seen as seven killstreak that is immediately available to the player along with the Spy Plane and Care Package.