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 M17A1 was designed with intent to allow a masked soldier to provide artificial respiration to an unmasked casualty, the resuscitation tube was a noble idea gone wrong.
The mask offers protection from chemical and biological warfare agents, but does not function properly in places where oxygen content is low.
[1] The mask is not meant to be used for firefighting and does not provide protection from radiation, however the filters will stop irradiated particles from entering the respiratory system of the wearer.
It is recommended that users continue wearing it until the biological or chemical agent is identified and verified cleared from the area using standardized unmasking procedures.