Gas Mask (perk)

Gas Mask is a Tier Two Perk in Call of Duty: World at War that reduces the effects of a Tabun gas grenade. This allowes a player to attack enemies affected by the grenades without hindrance. This is the only use for this perk, therefore, it is usually passed over for more useful perks, like Sleight of Hand, Stopping Power, and Overkill, especially since it takes what is arguably the most important perk slot. It is unlocked at Level 1, in the 'Light Gunner' class with a Thompson.

Multiplayer Tactics
If you want to use this perk effectively, it is almost necessary to use it with the Special Grenades x3 perk and, of course, Tabun Gas. This combination makes the player lethal when storming buildings, since they will be unaffected by the gas and can easily kill the poisoned enemies inside. Using a close-range weapon for this purpose is recommended. This perk should be used in a class with a fast-firing or high-damage weapon (such as a shotgun, or sub machine gun) for use in objective based games, especially if there is a point that must be captured, such as in "Domination", "War", or "Headquarters". In "Team Deathmatch", using this perk is normally considered not worth it, as perks such as Stopping Power and Juggernaut are generally more useful.

Another time where this perk can be useful is if one or more members of the enemy team are frequently using gas grenades against the player.

This perk is also useful for completing the Slow But Sure and Fumigator challenge, and absolutely necessary to have for completing the Gas Mask challenge.

Trivia

 * In Call of Duty 4: Modern Warfare most SAS and Russian soldiers wear gas masks throughout the campaign.
 * This does not change the player's character model. Oddly enough though, it's sister perk "Shades" (Which reduces directly blinding light from signal flares) does, adding a pair of WWII-era Aviator Shades to the user.
 * In Modern Warfare 2 singleplayer some Rangers will have Gas masks on their belts.
 * Most SAS soldiers are seen wearing a gas mask in Call of Duty 4: Modern Warfare (Nintendo DS).