THQ's Homefront 2/Gas Mask

Document Status: Yellow [Needs to consider trade-off with using the gas mask (how do we prevent players just putting it on and leaving it on, negating any gas attacks?)]
==Overview==
*The gasmask is given to you during the Independence Hall mission
*The gasmask is put on and removed by pressing dpad-?
*It plays a putting on/taking off anim which lasts several seconds
*The mask overlays the screen restricting vision and muffling audio
*The mask’s filter degrades when in contact with poison gas
*This is displayed on the HUD
*The filter can be replaced at any time using Homebrew
*While the filter lasts the mask provides complete protection from poison gas and tear gas
*When the filter runs out the gas has its normal effects
*For the effects of gasses see HF2_Chemical_Weapons