"The CDTF can provide training for select military personnel and units in the older M40 protective mask until it is completely phased out," said Castro. RELATED STORIES.

The Army says that test studies using a modified, commercial version of the M50 joint service general purpose mask, which replaced the M40 Field Protective Mask in the US armed forces in December ...

Currently fielded mask styles, including the M40 series and M45, are designed to fit 95 percent of head sizes. Newer masks, including the Joint Service General Purpose Mask (M50) and M53 series ...