Wearing the M40 Chemical-Biological Field Mask, US Marine Corporal Kevin Walter, Nuclear, Biological, Chemical (NBC)
US Navy Damage Control Technician 1ST Class Jeffrey Reynolds assist GUNNER's Mate (Guns) SEAMAN Apprentice Daniel
![7 18th Lrs Conduct Mopp Level 4 Ground Transportation Training Image: PICRYL - Public Domain Media Search Engine Public Domain Search} 7 18th Lrs Conduct Mopp Level 4 Ground Transportation Training Image: PICRYL - Public Domain Media Search Engine Public Domain Search}](https://cdn2.picryl.com/photo/2018/11/08/us-air-force-airman-1st-class-robert-mears-18th-f04285-640.jpg)
7 18th Lrs Conduct Mopp Level 4 Ground Transportation Training Image: PICRYL - Public Domain Media Search Engine Public Domain Search}
![File:US Navy 100806-N-9564W-089 Seabees run in place in full mission oriented protective posture (MOPP) gear and gas masks during a battalion readiness exercise at Naval Construction Battalion Center, Gulfport.jpg - Wikimedia Commons File:US Navy 100806-N-9564W-089 Seabees run in place in full mission oriented protective posture (MOPP) gear and gas masks during a battalion readiness exercise at Naval Construction Battalion Center, Gulfport.jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/3/3e/US_Navy_100806-N-9564W-089_Seabees_run_in_place_in_full_mission_oriented_protective_posture_%28MOPP%29_gear_and_gas_masks_during_a_battalion_readiness_exercise_at_Naval_Construction_Battalion_Center%2C_Gulfport.jpg)
File:US Navy 100806-N-9564W-089 Seabees run in place in full mission oriented protective posture (MOPP) gear and gas masks during a battalion readiness exercise at Naval Construction Battalion Center, Gulfport.jpg - Wikimedia Commons
![Wearing their Mission-Oriented Protective Posture response level 4 (MOPP-4) gear, CHIEF MASTER Sergeant (CMSGT) Michael Taylor, (right), USAF, buddy checks SENIOR AIRMAN (SRA) David Camacho's MCU-2P mask for proper seal, at the Wearing their Mission-Oriented Protective Posture response level 4 (MOPP-4) gear, CHIEF MASTER Sergeant (CMSGT) Michael Taylor, (right), USAF, buddy checks SENIOR AIRMAN (SRA) David Camacho's MCU-2P mask for proper seal, at the](https://cdn10.picryl.com/photo/2002/01/30/wearing-their-mission-oriented-protective-posture-response-level-4-mopp-4-gear-2f6512-1024.jpg)