Air Support Marker

The Air Support Marker is a special grenade featured in Call of Duty: Modern Warfare 3 .

Campaign
This grenade is featured in the missions "Bag and Drag", "Iron Lady", and "Down the Rabbit Hole". It's main purpose, is to signal locations from AI controlled airstrikes, typically from an AC-130. However, in "Iron Lady", it is also used to signal a bombing run that eventually destroys the Eiffel Tower. It emits a purple smoke to mark the location.

Overall, it functions like a typical Smoke Grenade in terms of throwing speed, draw time, and throwing distance.

Toxic Paradise
The Air Support Marker is also featured in the Special Ops mission Toxic Paradise. It functions exactly the same as it does in the campaign. However, the Air Support Marker is also used by enemies, in which it emits red smoke, instead of the normal purple on where the strike will be placed.

Survival Mode
The Air Support Marker is also available in Survival Mode, where it marks the location for a friendly AC-130 strike. It costs $2500 and is available from the Air Support Armory at level 4.