"Cover the battlefield with white smoke incendiary canisters that will weaken the enemy and burn any that wander too close."
Once the target is designated, a Su-25 flies in a straight line and drops several white phosphorus canisters on its path, obscuring the map with a white fog that can hinder vision for both teams. The canisters will burn for a period of time upon landing which can burn those who came too close and kill players with direct hits when being dropped. It is basically a lesser version of Napalm Strike in Black Ops.
The inclusion of White Phosphorus in Call of Duty: Modern Warfare has been criticized and sparking controversies prior to the game's release, noting that its usage is restricted by international law.