. . "These protective masks have inbuilt systems that facilitate communication, a tube for drinking water (A1 & A2), and a pair of outserts to protect eye lenses and prevent fogging. The mask is packed in a carrier that also contains other items like a nerve agent antidote kit (NAAK) and a convulsive antidote for nerve agents (CANA). It also contains a waterproof bag to protect filter elements from water damage. Other components attached are mask hoods to protect the head and neck area, a winterization kit to prevent frost accumulation during cold weather conditions and optical inserts for soldiers with vision defects. The A1 had a mask to mask resuscitation feature that was found to expose personnel to chemical agents. This forced the services to withdraw it from issue and replace it with the A2 without the feature. The mask offers protection from harmful agents, but does not function properly in places where oxygen content is low.[citation needed] The mask is not meant to be used for firefighting and does not provide protection from radiation. It is recommended that users continue wearing it until the biological or chemical agent is identified and cleared from the contaminated area. The M-17 series protective masks were phased out in the 1990s, replaced by the M40 Field Protective Mask."@en . . . "M17 gas mask"@en . . . "These protective masks have inbuilt systems that facilitate communication, a tube for drinking water (A1 & A2), and a pair of outserts to protect eye lenses and prevent fogging. The mask is packed in a carrier that also contains other items like a nerve agent antidote kit (NAAK) and a convulsive antidote for nerve agents (CANA). It also contains a waterproof bag to protect filter elements from water damage. Other components attached are mask hoods to protect the head and neck area, a winterization kit to prevent frost accumulation during cold weather conditions and optical inserts for soldiers with vision defects. The A1 had a mask to mask resuscitation feature that was found to expose personnel to chemical agents. This forced the services to withdraw it from issue and replace it with the "@en . . .