![File:US Navy 100806-N-4440L-051 Equipment Operator Construction Apprentice Steven Lott dons his chemical, biological, radiological (CBR) gear during a mission oriented protective posture (MOPP) level 4 drill.jpg - Wikimedia Commons File:US Navy 100806-N-4440L-051 Equipment Operator Construction Apprentice Steven Lott dons his chemical, biological, radiological (CBR) gear during a mission oriented protective posture (MOPP) level 4 drill.jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/5/57/US_Navy_100806-N-4440L-051_Equipment_Operator_Construction_Apprentice_Steven_Lott_dons_his_chemical%2C_biological%2C_radiological_%28CBR%29_gear_during_a_mission_oriented_protective_posture_%28MOPP%29_level_4_drill.jpg)
File:US Navy 100806-N-4440L-051 Equipment Operator Construction Apprentice Steven Lott dons his chemical, biological, radiological (CBR) gear during a mission oriented protective posture (MOPP) level 4 drill.jpg - Wikimedia Commons
![File:US Air Force (USAF) Senior Airman (SRA) Andrew Kirshbaum, 100th Logistics Readiness Squadron (LRS), gets into his Mission-Oriented Protective Posture response level 4 (MOPP-4) gear during a simulated chemical 031112-F-HL961-005.jpg - Wikimedia File:US Air Force (USAF) Senior Airman (SRA) Andrew Kirshbaum, 100th Logistics Readiness Squadron (LRS), gets into his Mission-Oriented Protective Posture response level 4 (MOPP-4) gear during a simulated chemical 031112-F-HL961-005.jpg - Wikimedia](https://upload.wikimedia.org/wikipedia/commons/d/d9/US_Air_Force_%28USAF%29_Senior_Airman_%28SRA%29_Andrew_Kirshbaum%2C_100th_Logistics_Readiness_Squadron_%28LRS%29%2C_gets_into_his_Mission-Oriented_Protective_Posture_response_level_4_%28MOPP-4%29_gear_during_a_simulated_chemical_031112-F-HL961-005.jpg)
File:US Air Force (USAF) Senior Airman (SRA) Andrew Kirshbaum, 100th Logistics Readiness Squadron (LRS), gets into his Mission-Oriented Protective Posture response level 4 (MOPP-4) gear during a simulated chemical 031112-F-HL961-005.jpg - Wikimedia
![File:US Navy 040822-N-9712C-002 A Seabee assigned to Naval Mobile Construction Battalion Four Zero (NMCB-40), mans a machine gun after donning Mission Oriented Protective Posture (MOPP) gear during a simulated Chemical-Biological at.jpg - File:US Navy 040822-N-9712C-002 A Seabee assigned to Naval Mobile Construction Battalion Four Zero (NMCB-40), mans a machine gun after donning Mission Oriented Protective Posture (MOPP) gear during a simulated Chemical-Biological at.jpg -](https://upload.wikimedia.org/wikipedia/commons/3/31/US_Navy_040822-N-9712C-002_A_Seabee_assigned_to_Naval_Mobile_Construction_Battalion_Four_Zero_%28NMCB-40%29%2C_mans_a_machine_gun_after_donning_Mission_Oriented_Protective_Posture_%28MOPP%29_gear_during_a_simulated_Chemical-Biological_at.jpg)
File:US Navy 040822-N-9712C-002 A Seabee assigned to Naval Mobile Construction Battalion Four Zero (NMCB-40), mans a machine gun after donning Mission Oriented Protective Posture (MOPP) gear during a simulated Chemical-Biological at.jpg -
![File:US Navy 101116-N-1786N-098 Sailors assigned to Amphibious Construction Battalion (ACB) 1, dress in full mission oriented protective posture (MOPP).jpg - Wikimedia Commons File:US Navy 101116-N-1786N-098 Sailors assigned to Amphibious Construction Battalion (ACB) 1, dress in full mission oriented protective posture (MOPP).jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/2/27/US_Navy_101116-N-1786N-098_Sailors_assigned_to_Amphibious_Construction_Battalion_%28ACB%29_1%2C_dress_in_full_mission_oriented_protective_posture_%28MOPP%29.jpg)
File:US Navy 101116-N-1786N-098 Sailors assigned to Amphibious Construction Battalion (ACB) 1, dress in full mission oriented protective posture (MOPP).jpg - Wikimedia Commons
![File:US Air Force (USAF) 119th Fighter Wing (FW) unit personnel wear their Chemical Warfare Defensive File:US Air Force (USAF) 119th Fighter Wing (FW) unit personnel wear their Chemical Warfare Defensive](https://upload.wikimedia.org/wikipedia/commons/c/c2/US_Air_Force_%28USAF%29_119th_Fighter_Wing_%28FW%29_unit_personnel_wear_their_Chemical_Warfare_Defensive_Equipment_%28CWDE%29_or_Mission_Oriented_Protective_Posture_level-3_%28MOPP-3%29_gear_during_a_unit_training_exercise_at_040207-F-WA217-019.jpg)