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A U.S. Marine puts on his M50 protective mask during a Combat Marksmanship Program live-fire range in Setermoen, Norway, April 14.

Photo by Lance Cpl. Nathaniel Hamilton

U.S. Marines clear their gas masks after being exposed to a chemical biological radiological nuclear training threat during a hike on Camp Lejeune, N.C., March, 11.

Photo by Lance Cpl. Scott Jenkins

U.S. Marine Corps Lance Cpl. Brennon Gant, an administrative specialist with the 22nd Marine Expeditionary, Unit test his gas mask prior to an Individual Protective Equipment Confidence training at the gas chamber aboard Camp Lejeune, N.C., Nov. 15, 2019. The exercise helps familiarize Marines and Sailors with their CBRN equipment and enhance their proficiency in CBRN defense situations.

Photo by Cpl. Tawanya Norwood

A Marine attached to Deployment Processing Command Reserve Support Unit-East, Force Headquarters Group, runs water of his face after gas chamber training at Marine Corps Base Camp Lejeune, North Carolina, Oct. 22, 2019. The DPC/RSU-East staff provide activated Reserve units/dets various types of training such as gas chamber qualification. During the qualification, Marines are taught chemical, biological, radiological and nuclear threats, reactions to CBRN attacks, and how to take proper care and use of a gas mask.

Photo by Sgt. Andy Martinez

Cpl. Brandon Alonzo, a chemical, biological, radiological and nuclear defense specialist chief with Combat Logistics Battalion 31, 31st Marine Expeditionary Unit, instructs Marines on how to correctly don the M50 gas mask during a class on chemical safety and awareness at Camp Hansen, Okinawa, Japan, September 24, 2019. The 31st MEU, the Marine Corps' only continuously forward-deployed MEU, provides a flexible and lethal force ready to perform a wide range of military operations as the premier crisis response force in the Indo-Pacific region.

Photo by Cpl. Luis Velez

U.S. Marine James Boncore, a chemical, biological, radiological and nuclear defense specialist, with 2nd Air Naval Gunfire Liaison Company, II Marine Expeditionary Force Information Group, burns chlorobenzalmalononitrile tablets during a gas chamber training event at Camp Lejeune, N.C., July 2, 2019. Gas chamber training consists of Marines being exposed to chlorobenzalmalononitrile tablets, commonly known as CS gas, in order to familiarize themselves with their M50 gas mask.

Photo by Lance Cpl. Nello Miele

Sgt. Maj. Frank Gratacos, sergeant major, Marine Aircraft Group 24, signals Marines to remove their gas masks after passing him during a gas mask run, Marine Corps Air Station, Kaneohe Bay, Nov. 16, 2018. The physical training event aimed to build unit readiness and cohesion, while also familiarizing Marines with conducting strenuous activity while wearing their gas masks.

Photo by Cpl. Luke Kuennen

U.S. Marines run through CS gas during the hike portion of the 1st Marine Division Super Squad Competition at Marine Corps Base Camp Pendleton, California, Aug. 30, 2018. The competition tests the Marines in a broad spectrum of infantry related skills to include offensive and defensive operations, patrolling techniques, and combat marksmanship, to determine the best squad within 1st MARDIV.

Photo by Lance Cpl. Audrey Rampton

A U.S. Marine with Black Sea Rotational Force 18.1, prepares to engage targets with a M240B machine gun while wearing his gas mask during Exercise Platinum Lion 18 at Novo Selo Training Area, Bulgaria, Aug. 3, 2018. Platinum Lion is an annual field training exercise that reinforces relationships in a joint training environment, builds understanding of partner nation tactics, techniques and procedures, and increases interoperability with Allied and partner forces.

Photo by Lance Cpl. Angel Travis

A U.S. Marine clears his M50 joint service general purpose mask during gas chamber training at Marine Corps Air Station Futenma, Okinawa, Japan, July 26, 2018. Annually, Marines are required to train in the gas chamber to build confidence. Marines need to be prepared in the event of a gas attack so he or she can calmly react and properly don his or her mask.

Photo by Cpl. Andy Martinez

Lance Cpl. Joshua Hill, an infantry Marine with India Company, 3rd Battalion, 8th Marine Regiment, 2nd Marine Division stands by to move away from CS gas during Marine Corps Combat Readiness Evaluation on Camp Lejeune, N.C., May 11, 2018. MCCRE is a pre-deployment training evaluation designed to test the skill set of Marines during various combat scenarios.

Photo by Lance Cpl. Tanner Seims

Marines and Sailors with U.S. Marine Corps Forces, Special Operations Command, demonstrate proper removal of a gas mask from a simulated chemical contact victim while training for the medical management of chemical and biological causalties during an exercise at Stone Bay on Marine Corps Base Camp Lejeune, N.C., Dec. 6, 2017. Long prohibited by international agreements, chemical weapons have been increasingly used on the battlefield by American adversaries including violent extremist organizations. Raiders gained valuable practical application skills in handling casualties in complex and dangerous chemical environments.

Photo by Sgt. Salvador R. Moreno

A hose pumps fuel from a U.S. Marine Corps KC-130J Hercules with Marine Aerial Refueler Transport Squadron (VMGR) 152, to a U.S. Army MH-60 Black Hawk helicopter with the 4-160th Special Operations Aviation Regiment (SOAR), while conducting air delivered ground refueling during unit-level training Evergreen in Salem, Oregon, August 17, 2017. VMGR-152 aircrew Marines deployed a mobile gas station for rotary wing aircraft, running hoses from the KC-130J in a tactical manner, which allowed aircraft to taxi in, receive fuel and continue on their way with no delay. (U.S. Marine Corps photo by Cpl. Joseph Abrego)

Photo by Cpl. Joseph Abrego

Lance Cpl. Beau Smith, a Marine with Identification and Detection Platoon, Chemical Biological Incident Response Force, checks for contamination on a victim using a gas monitor at Guardian Centers in Perry, Georgia, March 23, 2017 during Exercise Scarlet Response 2017. During a 36-hour field operation, a chemical agent was released in the air as part of an injection to the scenario of the operation.

Photo by Sgt. Terence Brady

A Marine completes a puzzle to test his dexterity during a field exercise at Marine Corps Outlying Field Atlantic Nov. 30, 2016. Twenty-two Marines with Chemical, Biological, Radiological and Nuclear Defense, 2nd Marine Aircraft Wing, conducted a week-long annual training exercise that refreshed the defense specialists on the roots of their basic military occupational specialty training. The exercise included an assortment of stations and classes that tested the Marines physically and mentally.

Photo by Lance Cpl. Cody Lemons

Marines circle the top of a tower during a field exercise at Marine Corps Outlying Field Atlantic Nov. 30, 2016. Twenty-two Marines with Chemical, Biological, Radiological and Nuclear Defense, 2nd Marine Aircraft Wing, conducted a week-long annual training exercise that refreshed the defense specialists on the roots of their basic military occupational specialty training. The exercise included an assortment of stations and classes that tested the Marines physically and mentally.

Photo by Lance Cpl. Cody Lemons

A Marine removes his joint chemical agent detector during a field exercise at Marine Corps Outlying Field Atlantic Nov. 30, 2016. Twenty-two Marines with Chemical, Biological, Radiological and Nuclear Defense, 2nd Marine Aircraft Wing, conducted a week-long annual training exercise that refreshed the defense specialists on the roots of their basic military occupational specialty training. The exercise included an assortment of stations and classes that tested the Marines physically and mentally.

Photo by Lance Cpl. Cody Lemons

A Marine reads the air pressure in his air tank during a field exercise at Marine Corps Outlying Field Atlantic Nov. 30, 2016. Twenty-two Marines with Chemical, Biological, Radiological and Nuclear Defense, 2nd Marine Aircraft Wing, conducted a week-long annual training exercise that refreshed the defense specialists on the roots of their basic military occupational specialty training. The exercise included an assortment of stations and classes that tested the Marines physically and mentally.

Photo by Lance Cpl. Mackenzie Gibson

U.S. Marine Corps Lance Cpl. Anthony Acedo, rifleman with 1st Battalion, 7th Marine Regiment, reacts to a surprise gas attack during the Advanced Infantry Course (AIC) aboard Kahuku Training Area, Sept. 20, 2016. AIC is intermediate training designed to enhance and test the Marine's skills and leadership abilities as squad leaders in a rifle platoon. (U.S. Marine Corps Photo by Cpl. Aaron S. Patterson)

Photo by Cpl. Aaron Patterson

KAHUKU TRAINING FACILITY – Marines don their gas masks as simulated hostiles use O-chlorobenzalmalononitrile gas (CS gas) during a raid as part of a training exercise aboard the Kahuku Training Facility, Sept. 20, 2016. The exercise is part of a 7-week-long training known as the Advance Infantry Course. The Advance Infantry Course, which is conducted by the Advance Infantry Battalion, Detachment Hawaii, is an advanced 0311 (Rifleman) Military Occupational Specialty course for squad leaders who are currently serving in the operating field. Originally only for 3rd Marine Division, the course here has opened up to various infantry units throughout the Marine Corps. Marines start with a week of proofing their prerequisites that are required for the course, confirming their basic skill sets, and then spend two weeks in a garrison environment doing course work and physical training routines geared toward the squad leader. Towards the second half of the course, Marines conduct one live fire week, followed by three consecutive weeks in the field, progressing from an urban exercise to a patrolling exercise, with offensive and defensive tactics. Marines trained in multiple areas on the island, from high in the mountains of the Kahuku Training Facility to the Military Operation in Urban Terrain facilities on Marine Corps Training Area Bellows. (U.S. Marine Corps Photo by Lance Cpl. Jesus Sepulveda Torres)

Photo by Lance Cpl. Jesus Sepulveda Torres