Joint Service General Purpose Mask M-50/M-51 - Wikipedia
Army ISSUE M50 / M51 / M61 Gask Mask with 4 filters
US Military Issue Avon M50 CBRN Gas Mask-Medium – Ma Deuce Trading Post
FM50 Respirator NATO Gas Mask | Avon Protection
AVON C50 CBRN All Challenge Protective Twin Port Mask
The makers of the Army's gas mask are looking into beard-friendly options
Avon Protection FM50 (APR) Air Purifying Respirator 71400, CBRN full face mask, specifically designed to meet the latest NATO forces and military mask requirements - Dana Safety Supply
M50 US Military Respirator Gas Mask | Avon Protection