Intelligent Munitions System

"Once you hear the I.M.S. go off, it's too late."

- In-game multiplayer intel

The  (I.M.S.) is a 5-point Assault pointstreak reward that appears in Call of Duty: Modern Warfare 3.

Call of Duty: Modern Warfare 3
The I.M.S. is an anti-personnel system similar to the Bouncing Betty. It is a small box on the floor that fires an explosive shell vertically, which in turn then shoots an explosive down at enemies. It can deploy a total of four explosive charges before self-destructing.

The I.M.S. makes a low-pitched "ping" sound when an enemy player enters close proximity, right as it sets off one of its charges. A set-off charge will almost always kill the player who set it off, regardless of if he has a Riot Shield or Blast Shield. It can be temporarily deactivated by concussion grenades and flashbangs.

It can also be destroyed by an EMP Grenade, or by simply shooting it until it takes enough damage. If a player places a second I.M.S the first one will self destruct instantly. It is also one of the explosives that can be delayed by Stalker Pro. Putting a Trophy System over the I.M.S will allow the user with even more protection from shot explosives.

Trivia

 * It takes 3 hits from an I.M.S. to kill a Juggernaut.
 * The I.M.S used the AC-130 icon in the killfeed in early development (seen at end of the survival mode trailer). This was likely due to there not being an icon for the I.M.S at that point.