Call of Duty: Black OpsEdit
It is used in the second part of the level "Rebirth" and, when the player controls Jason Hudson. When the Nova gas is released, and all the US soldiers put on their gas masks, the player's current weapon will disappear, and the mask will appear in the player's hand, placed on the player's face and then taken off once the player reaches the bio facility. Note that when it is placed on the players face, the bottom right-hand corner of the player's screen will label "Gas mask" as a weapon. The mask will start to develop cracks depending on how much damage the player takes and will eventually break, if the player dies. They will restart in the same place they died, but with a new Gas Mask.
Call of Duty: Modern Warfare 3Edit
Gas Mask is used in Campaign, and once in Special Ops. In Campaign, it is seen in the mission Bag and Drag, being used by Frost and Delta Force operatives, as well as Russian Army. It is also seen in the mission Return to Sender used by Price, Soap and Yuri after setting off the gas canisters. Price gives also gives one to Waraabe, shortly before killing him. In Special Ops, it is used in mission Toxic Paradise.
- The Gas Mask is also in the icon of the perk, Tactical Mask.
- Using the Tactical Mask perk in Multiplayer grants the player the benefits of a gas mask, but the gas mask does not appear on the character's head model.
- The animation for putting on the P.E.S. is the same as putting on the Gas Mask in the level Rebirth.