Danger Close (perk)

Danger Close is a tier two perk in Call of Duty: Modern Warfare 2 that increases explosive damage. The pro version of this increases explosive damage from killstreaks like airstrikes and AC-130 and is unlocked by getting 100 kills with explosives (Claymores, Semtex, etc) while using this perk. It replaces Sonic Boom from Call of Duty 4: Modern Warfare and Fireworks from Call of Duty: World at War

This perk is unlocked at rank 33 and is the last tier two perk unlocked.

Trivia

 * In military terms, "Danger-Close" refers a situation in which friendly infantry is within 600 meters of a target/area marked for an artillery or air strike; specifically it is used to alert a supporting gunner (aircraft pilot dropping a bomb, helicopter gunner firing rockets, artillery crew firing shells, etc) of the friendly soldiers in the immediate vicinity of the designated target area, and that extra care must be taken to ensure the ordnance hits the target and nothing else.
 * The name of this perk is likely related to various comments relating to Shepherd's tendency to order artillery dangerously close to units under his command.
 * The easiest way to achieve the Pro version of this perk is to use a grenade launcher.