https://us.msasafety.com/Air-Purifying-Respirators-%28APR%29/Elastomeric-Full-Face-Masks/CBRN-and-Riot-Control-Gas-Masks/p/000050001700001500

The MSA Millenium mask sets the standard for performance and protection. A Hycar version of the reliable military-style gas mask (MCU-2/P Mask, used by the U.S.Air Force in Desert Storm) that combines high performance, customized fit, comfort, and cost efficiency. Flexible, 1-piece polyurethane lens with wide field of vision is bonded to durable Hycar rubber facepiece. Dual-canister mount (NATO 40mm thread) allows weapon sighting from either shoulder. Drinking tube provides connection for fluid ingestion in contaminated atmospheres during extended wear. Fully elastic, 6-point head harness promotes easy on-off, easy adjustment, no hair pulling. Internal nosecup with 2 check valves deflects air from the lens, reduces fogging. Standard mechanical speaking diaphragm included, or add MSA's optional ESP® Communications System. NIOSH-approved (No.TC-14G-0254) for protection against chloroacetophenone (CN), chlorobenzylidene (CS), 100 particulate efficiency level, and particulates. Order filter canisters separately.