EMP

The EMP (ElectroMagnetic Pulse) is an unlockable killstreak in Call of Duty: Modern Warfare 2. Requiring 15 consecutive kills, or 14 with the Hardline perk, this killstreak temporarily disables all electronic-based weapon attachments, killstreaks, and even the HUD of the user's enemies. If any hostile killstreak is active when the EMP is used, those killstreaks will be destroyed, in exception of the Tactical Nuke. Hostiles cannot call in any killstreaks, including the tactical nuke, while your EMP is active.

Affected weapon attachments

 * Red Dot Sight - "Red dot" disappears (exept on the F2000 and the ACR)
 * Holographic Sight - Targeting reticule disappears
 * ACOG Scope - Red cross hairs disappear, but the black cross hairs remain
 * Thermal Scope - Thermal vision is disabled, but the in-sight cross hairs remain
 * Heartbeat Sensor - Screen will be filled with static

Affected weapons

 * Javelin - Unable to be used because it only works on lock-on
 * Stinger - Unable to be used because it only works on lock-on

Trivia

 * An EMP is caused by releasing an electromagnetic pulse similar to that released in a nuclear explosion.
 * An actual EMP would effectively destroy any computer chip caught in the blast radius. The fact that this killstreak's effects are temporary, or even that it only affects the user's enemies, is impossible. The EMP which occurred in the level "Second Sun" is much more realistic.
 * An EMP should realistically not have any effect on ACOG scopes. This is because they are illuminated by tritium, a radioactive isotope of hydrogen, and contain no electronics like the other optics in the game.
 * It is possible to obtain an EMP from a Care Package.
 * The fact that the Heartbeat Sensor turns to static is unrealistic, as a real-life EMP would simply disable the screen.
 * The EMP killstreak cannot disable the Tactical Nuke killstreak while it is counting down (Proof: ), but it can prevent someone from using it any time after the EMP is used.
 * When an EMP is released, the opposing team loses the ability to auto-lock objects in the air (UAV, Helicopters, Airplanes).
 * When your team gets EMP'd your announcer says, "We've been EMP'd, electronics are down." However, he is saying this through a radio which leaves it to speculation on what devices are affected by the EMP.
 * If the player looks outside the map immediately after an EMP is deployed (by either team), they can see a nuclear explosion identical to the one seen in Second Sun in the distant sky.