An official website of the United States government

Here's how you know

Official websites use .mil

A .mil website belongs to an official U.S. Department of Defense organization in the United States.

Secure .mil websites use HTTPS

A lock () or https:// means you’ve safely connected to the .mil website. Share sensitive information only on official, secure websites.

Marines

Photos

Imagery taken by MARFORRES COMMSTRAT

Filter

CLEAR ALL 52 results found

U.S. Marine Corps Sgt. Kevin Manciavelez, an infantry squad leader with 2nd Battalion, 23rd Marines forward deployed with 4th Marine Regiment, 3d Marine Division as part of the Unit Deployment Program, commands fellow Marines during an assault of an underground tunnel with U.S. Army Soldiers with the 23rd Chemical Battalion during joint chemical, biological, radiological, and nuclear defense training during Korea Viper 25.4 at Camp Stanley, South Korea, May 20, 2025. Korea Viper is a recurring exercise series that demonstrates the Republic of Korea and U.S. Marine Corps' ability to respond decisively in the region as a singular, unified force while strengthening relationships and trust between the two allies. Manciavelez is a native of California. (U.S. Marine Corps photo by Lance Cpl. Tucker Mocan)

U.S. Marine Corps Sgt. Kevin Manciavelez, an infantry squad leader with 2nd Battalion, 23rd Marines forward deployed with 4th Marine Regiment, 3d Marine Division as part of the Unit Deployment Program, commands fellow Marines during an assault of an underground tunnel with U.S. Army Soldiers with the 23rd Chemical Battalion during joint chemical, biological, radiological, and nuclear defense training during Korea Viper 25.4 at Camp Stanley, South Korea, May 20, 2025. Korea Viper is a recurring exercise series that demonstrates the Republic of Korea and U.S. Marine Corps' ability to respond decisively in the region as a singular, unified force while strengthening relationships and trust between the two allies. Manciavelez is a native of California. (U.S. Marine Corps photo by Lance Cpl. Tucker Mocan)

Photo by Lance Cpl. Tucker Mocan

A U.S. Marine with Marine Aircraft Group 41, 4th Marine Aircraft Wing, digs a hole into the ground to fit a pole during a chemical, biological, radiological and nuclear individual survival skills course at Canadian Forces Base Cold Lake, Canada, June 14, 2019, in support of Sentinel Edge 19. CBRN training test Marines abilities to respond in the event of chemical, biological, radiological or nuclear contamination. Training exercises such as SE19 ensure Reserve Marines are proficient and capable of successful integration with active-duty Marines, making Marine Forces Reserve critical to the Marine Corps’ Total Force. (U.S. Marine Corps photo by Sgt. Andy O. Martinez)

A U.S. Marine with Marine Aircraft Group 41, 4th Marine Aircraft Wing, digs a hole into the ground to fit a pole during a chemical, biological, radiological and nuclear individual survival skills course at Canadian Forces Base Cold Lake, Canada, June 14, 2019, in support of Sentinel Edge 19. CBRN training test Marines abilities to respond in the event of chemical, biological, radiological or nuclear contamination. Training exercises such as SE19 ensure Reserve Marines are proficient and capable of successful integration with active-duty Marines, making Marine Forces Reserve critical to the Marine Corps’ Total Force. (U.S. Marine Corps photo by Sgt. Andy O. Martinez)

Photo by Sgt. Andy Martinez

A U.S. Marine with Marine Aircraft Group 41, 4th Marine Aircraft Wing, uses barricade tape to block off a contaminated area during a chemical, biological, radiological and nuclear individual survival skills course at Canadian Forces Base Cold Lake, Canada, June 14, 2019, in support of Sentinel Edge 19. CBRN training test Marines abilities to respond in the event of chemical, biological, radiological or nuclear contamination. Training exercises such as SE19 ensure Reserve Marines are proficient and capable of successful integration with active-duty Marines, making Marine Forces Reserve critical to the Marine Corps’ Total Force. (U.S. Marine Corps photo by Sgt. Andy O. Martinez)

A U.S. Marine with Marine Aircraft Group 41, 4th Marine Aircraft Wing, uses barricade tape to block off a contaminated area during a chemical, biological, radiological and nuclear individual survival skills course at Canadian Forces Base Cold Lake, Canada, June 14, 2019, in support of Sentinel Edge 19. CBRN training test Marines abilities to respond in the event of chemical, biological, radiological or nuclear contamination. Training exercises such as SE19 ensure Reserve Marines are proficient and capable of successful integration with active-duty Marines, making Marine Forces Reserve critical to the Marine Corps’ Total Force. (U.S. Marine Corps photo by Sgt. Andy O. Martinez)

Photo by Sgt. Andy Martinez

A U.S. Marine with Marine Aircraft Group 41, 4th Marine Aircraft Wing, uses a joint chemical agent detector to scan a contaminated box during a chemical, biological, radiological and nuclear individual survival skills course at Canadian Forces Base Cold Lake, Canada, June 14, 2019, in support of Sentinel Edge 19. CBRN training test Marines abilities to respond in the event of chemical, biological, radiological or nuclear contamination. Training exercises such as SE19 ensure Reserve Marines are proficient and capable of successful integration with active-duty Marines, making Marine Forces Reserve critical to the Marine Corps’ Total Force. (U.S. Marine Corps photo by Sgt. Andy O. Martinez)

A U.S. Marine with Marine Aircraft Group 41, 4th Marine Aircraft Wing, uses a joint chemical agent detector to scan a contaminated box during a chemical, biological, radiological and nuclear individual survival skills course at Canadian Forces Base Cold Lake, Canada, June 14, 2019, in support of Sentinel Edge 19. CBRN training test Marines abilities to respond in the event of chemical, biological, radiological or nuclear contamination. Training exercises such as SE19 ensure Reserve Marines are proficient and capable of successful integration with active-duty Marines, making Marine Forces Reserve critical to the Marine Corps’ Total Force. (U.S. Marine Corps photo by Sgt. Andy O. Martinez)

Photo by Sgt. Andy Martinez

A U.S. Marine with Marine Aircraft Group 41, 4th Marine Aircraft Wing, uses a joint chemical agent detector to find contaminations during a chemical, biological, radiological and nuclear individual survival skills course at Canadian Forces Base Cold Lake, Canada, June 14, 2019, in support of Sentinel Edge 19. CBRN training test Marines abilities to respond in the event of chemical, biological, radiological or nuclear contamination. Training exercises such as SE19 ensure Reserve Marines are proficient and capable of successful integration with active-duty Marines, making Marine Forces Reserve critical to the Marine Corps’ Total Force. (U.S. Marine Corps photo by Sgt. Andy O. Martinez)

A U.S. Marine with Marine Aircraft Group 41, 4th Marine Aircraft Wing, uses a joint chemical agent detector to find contaminations during a chemical, biological, radiological and nuclear individual survival skills course at Canadian Forces Base Cold Lake, Canada, June 14, 2019, in support of Sentinel Edge 19. CBRN training test Marines abilities to respond in the event of chemical, biological, radiological or nuclear contamination. Training exercises such as SE19 ensure Reserve Marines are proficient and capable of successful integration with active-duty Marines, making Marine Forces Reserve critical to the Marine Corps’ Total Force. (U.S. Marine Corps photo by Sgt. Andy O. Martinez)

Photo by Sgt. Andy Martinez

A U.S. Marine with Marine Aircraft Group 41, 4th Marine Aircraft Wing, searches for contaminated areas during a chemical, biological, radiological and nuclear individual survival skills course at Canadian Forces Base Cold Lake, Canada, June 14, 2019, in support of Sentinel Edge 19. CBRN training test Marines abilities to respond in the event of chemical, biological, radiological or nuclear contamination. Training exercises such as SE19 ensure Reserve Marines are proficient and capable of successful integration with active-duty Marines, making Marine Forces Reserve critical to the Marine Corps’ Total Force. (U.S. Marine Corps photo by Sgt. Andy O. Martinez)

A U.S. Marine with Marine Aircraft Group 41, 4th Marine Aircraft Wing, searches for contaminated areas during a chemical, biological, radiological and nuclear individual survival skills course at Canadian Forces Base Cold Lake, Canada, June 14, 2019, in support of Sentinel Edge 19. CBRN training test Marines abilities to respond in the event of chemical, biological, radiological or nuclear contamination. Training exercises such as SE19 ensure Reserve Marines are proficient and capable of successful integration with active-duty Marines, making Marine Forces Reserve critical to the Marine Corps’ Total Force. (U.S. Marine Corps photo by Sgt. Andy O. Martinez)

Photo by Sgt. Andy Martinez

A U.S. Marine with Marine Aircraft Group 41, 4th Marine Aircraft Wing, finds the source of the chemical contamination during a chemical, biological, radiological and nuclear individual survival skills course at Canadian Forces Base Cold Lake, Canada, June 14, 2019, in support of Sentinel Edge 19. CBRN training test Marines abilities to respond in the event of chemical, biological, radiological or nuclear contamination. Training exercises such as SE19 ensure Reserve Marines are proficient and capable of successful integration with active-duty Marines, making Marine Forces Reserve critical to the Marine Corps’ Total Force. (U.S. Marine Corps photo by Sgt. Andy O. Martinez)

A U.S. Marine with Marine Aircraft Group 41, 4th Marine Aircraft Wing, finds the source of the chemical contamination during a chemical, biological, radiological and nuclear individual survival skills course at Canadian Forces Base Cold Lake, Canada, June 14, 2019, in support of Sentinel Edge 19. CBRN training test Marines abilities to respond in the event of chemical, biological, radiological or nuclear contamination. Training exercises such as SE19 ensure Reserve Marines are proficient and capable of successful integration with active-duty Marines, making Marine Forces Reserve critical to the Marine Corps’ Total Force. (U.S. Marine Corps photo by Sgt. Andy O. Martinez)

Photo by Sgt. Andy Martinez

A U.S. Marine with Marine Aircraft Group 41, 4th Marine Aircraft Wing, helps another Marine put on his gear during a chemical, biological, radiological and nuclear individual survival skills course at Canadian Forces Base Cold Lake, Canada, June 14, 2019, in support of Sentinel Edge 19. CBRN training test Marines abilities to respond in the event of chemical, biological, radiological or nuclear contamination. Training exercises such as SE19 ensure Reserve Marines are proficient and capable of successful integration with active-duty Marines, making Marine Forces Reserve critical to the Marine Corps’ Total Force. (U.S. Marine Corps photo by Sgt. Andy O. Martinez)

A U.S. Marine with Marine Aircraft Group 41, 4th Marine Aircraft Wing, helps another Marine put on his gear during a chemical, biological, radiological and nuclear individual survival skills course at Canadian Forces Base Cold Lake, Canada, June 14, 2019, in support of Sentinel Edge 19. CBRN training test Marines abilities to respond in the event of chemical, biological, radiological or nuclear contamination. Training exercises such as SE19 ensure Reserve Marines are proficient and capable of successful integration with active-duty Marines, making Marine Forces Reserve critical to the Marine Corps’ Total Force. (U.S. Marine Corps photo by Sgt. Andy O. Martinez)

Photo by Sgt. Andy Martinez

A U.S. Marine with Marine Aircraft Group 41, 4th Marine Aircraft Wing, puts on a M50 joint service general purpose mask during a chemical, biological, radiological and nuclear individual survival skills course at Canadian Forces Base Cold Lake, Canada, June 14, 2019, in support of Sentinel Edge 19. CBRN training test Marines abilities to respond in the event of chemical, biological, radiological or nuclear contamination. Training exercises such as SE19 ensure Reserve Marines are proficient and capable of successful integration with active-duty Marines, making Marine Forces Reserve critical to the Marine Corps’ Total Force. (U.S. Marine Corps photo by Sgt. Andy O. Martinez)

A U.S. Marine with Marine Aircraft Group 41, 4th Marine Aircraft Wing, puts on a M50 joint service general purpose mask during a chemical, biological, radiological and nuclear individual survival skills course at Canadian Forces Base Cold Lake, Canada, June 14, 2019, in support of Sentinel Edge 19. CBRN training test Marines abilities to respond in the event of chemical, biological, radiological or nuclear contamination. Training exercises such as SE19 ensure Reserve Marines are proficient and capable of successful integration with active-duty Marines, making Marine Forces Reserve critical to the Marine Corps’ Total Force. (U.S. Marine Corps photo by Sgt. Andy O. Martinez)

Photo by Sgt. Andy Martinez

A U.S. Marine with Marine Aircraft Group 41, 4th Marine Aircraft Wing, puts on a M50 joint service general purpose mask during a chemical, biological, radiological and nuclear individual survival skills course at Canadian Forces Base Cold Lake, Canada, June 14, 2019, in support of Sentinel Edge 19. CBRN training test Marines abilities to respond in the event of chemical, biological, radiological or nuclear contamination. Training exercises such as SE19 ensure Reserve Marines are proficient and capable of successful integration with active-duty Marines, making Marine Forces Reserve critical to the Marine Corps’ Total Force. (U.S. Marine Corps photo by Sgt. Andy O. Martinez)

A U.S. Marine with Marine Aircraft Group 41, 4th Marine Aircraft Wing, puts on a M50 joint service general purpose mask during a chemical, biological, radiological and nuclear individual survival skills course at Canadian Forces Base Cold Lake, Canada, June 14, 2019, in support of Sentinel Edge 19. CBRN training test Marines abilities to respond in the event of chemical, biological, radiological or nuclear contamination. Training exercises such as SE19 ensure Reserve Marines are proficient and capable of successful integration with active-duty Marines, making Marine Forces Reserve critical to the Marine Corps’ Total Force. (U.S. Marine Corps photo by Sgt. Andy O. Martinez)

Photo by Sgt. Andy Martinez

A U.S. Marine with Marine Aircraft Group 41, 4th Marine Aircraft Wing, participates in a chemical, biological, radiological and nuclear individual survival skills course at Canadian Forces Base Cold Lake, Canada, June 14, 2019, in support of Sentinel Edge 19. CBRN training test Marines abilities to respond in the event of chemical, biological, radiological or nuclear contamination. Training exercises such as SE19 ensure Reserve Marines are proficient and capable of successful integration with active-duty Marines, making Marine Forces Reserve critical to the Marine Corps’ Total Force. (U.S. Marine Corps photo by Sgt. Andy O. Martinez)

A U.S. Marine with Marine Aircraft Group 41, 4th Marine Aircraft Wing, participates in a chemical, biological, radiological and nuclear individual survival skills course at Canadian Forces Base Cold Lake, Canada, June 14, 2019, in support of Sentinel Edge 19. CBRN training test Marines abilities to respond in the event of chemical, biological, radiological or nuclear contamination. Training exercises such as SE19 ensure Reserve Marines are proficient and capable of successful integration with active-duty Marines, making Marine Forces Reserve critical to the Marine Corps’ Total Force. (U.S. Marine Corps photo by Sgt. Andy O. Martinez)

Photo by Sgt. Andy Martinez

U.S. Marine Corps Sgt. Eric Gore, a chemical, biological, radiological and nuclear defense chief with Marine Wing Support Squadron 471, Marine Aircraft Group 41, 4th Marine Aircraft Wing, teaches a CBRN individual survival skills course at Canadian Forces Base Cold Lake, Canada, June 14, 2019, in support of Sentinel Edge 19. CBRN training test Marines abilities to respond in the event of chemical, biological, radiological or nuclear contamination. Training exercises such as SE19 ensure Reserve Marines are proficient and capable of successful integration with active-duty Marines, making Marine Forces Reserve critical to the Marine Corps’ Total Force. (U.S. Marine Corps photo by Sgt. Andy O. Martinez)

U.S. Marine Corps Sgt. Eric Gore, a chemical, biological, radiological and nuclear defense chief with Marine Wing Support Squadron 471, Marine Aircraft Group 41, 4th Marine Aircraft Wing, teaches a CBRN individual survival skills course at Canadian Forces Base Cold Lake, Canada, June 14, 2019, in support of Sentinel Edge 19. CBRN training test Marines abilities to respond in the event of chemical, biological, radiological or nuclear contamination. Training exercises such as SE19 ensure Reserve Marines are proficient and capable of successful integration with active-duty Marines, making Marine Forces Reserve critical to the Marine Corps’ Total Force. (U.S. Marine Corps photo by Sgt. Andy O. Martinez)

Photo by Sgt. Andy Martinez

U.S. Marines with Marine Aircraft Group 41, 4th Marine Aircraft Wing, participate in chemical, biological, radiological and nuclear individual survival skills training at Canadian Forces Base Cold Lake, Canada, June 14, 2019, in support of Sentinel Edge 19. CBRN training test Marines abilities to respond in the event of chemical, biological, radiological or nuclear contamination. Training exercises such as SE19 ensure Reserve Marines are proficient and capable of successful integration with active-duty Marines, making Marine Forces Reserve critical to the Marine Corps’ Total Force. (U.S. Marine Corps photo by Sgt. Andy O. Martinez)

U.S. Marines with Marine Aircraft Group 41, 4th Marine Aircraft Wing, participate in chemical, biological, radiological and nuclear individual survival skills training at Canadian Forces Base Cold Lake, Canada, June 14, 2019, in support of Sentinel Edge 19. CBRN training test Marines abilities to respond in the event of chemical, biological, radiological or nuclear contamination. Training exercises such as SE19 ensure Reserve Marines are proficient and capable of successful integration with active-duty Marines, making Marine Forces Reserve critical to the Marine Corps’ Total Force. (U.S. Marine Corps photo by Sgt. Andy O. Martinez)

Photo by Sgt. Andy Martinez

Cpl. Eric Gore, the chemical, biological, radiological and nuclear defense specialist training non-commissioned officer with Headquarters Battalion, Marine Forces Reserve, stands outside of Marine Corps Support Facility in New Orleans, Oct. 16, 2017. Gore took leave to travel to Beaumont, Texas, to assist in relief efforts in wake of Hurricane Harvey, which made landfall in southeast Texas on Aug. 25, 2017; flooding thousands of homes and displacing more than 30,000 people. (U.S. Marine Corps photo by Lance Cpl. Niles Lee/Released)

Cpl. Eric Gore, the chemical, biological, radiological and nuclear defense specialist training non-commissioned officer with Headquarters Battalion, Marine Forces Reserve, stands outside of Marine Corps Support Facility in New Orleans, Oct. 16, 2017. Gore took leave to travel to Beaumont, Texas, to assist in relief efforts in wake of Hurricane Harvey, which made landfall in southeast Texas on Aug. 25, 2017; flooding thousands of homes and displacing more than 30,000 people. (U.S. Marine Corps photo by Lance Cpl. Niles Lee/Released)

Photo by Lance Cpl. Niles Lee

TUNNEL HILL, Ga. - Cpl. Phillip Butler and Sgt. Elliot Homan, hazmat technicians with Chemical Biological Radiological Nuclear Platoon, Combat Logistics Regiment 4, 4th Marine Logistics Group, Marine Forces Reserve, document and sample an unknown substance during a CBRN training exercise at Volunteer Training Site, Catoosa, Tunnel Hill, Ga., April 6, 2017. The assessment and consequence management team conducted their quarterly ACM training to enhance their CBRN capabilities. The training focused on specialized identification, sampling and the collecting of CBRN materials as well as simulated weapons of mass destruction. (U.S. Marine Corps photo by Cpl. Devan Alonzo Barnett/Released)

TUNNEL HILL, Ga. - Cpl. Phillip Butler and Sgt. Elliot Homan, hazmat technicians with Chemical Biological Radiological Nuclear Platoon, Combat Logistics Regiment 4, 4th Marine Logistics Group, Marine Forces Reserve, document and sample an unknown substance during a CBRN training exercise at Volunteer Training Site, Catoosa, Tunnel Hill, Ga., April 6, 2017. The assessment and consequence management team conducted their quarterly ACM training to enhance their CBRN capabilities. The training focused on specialized identification, sampling and the collecting of CBRN materials as well as simulated weapons of mass destruction. (U.S. Marine Corps photo by Cpl. Devan Alonzo Barnett/Released)

Photo by Cpl. Devan Alonzo Barnett

TUNNEL HILL, Ga. – Staff Sgt. Jarrod Tepe, a platoon sergeant with Personal Retrieval and Processing Company, Combat Logistics Regiment 45, 4th Marine Logistics Group, Marine Forces Reserve, gets decontaminated and sprayed down by Lance Cpl. Jacob Jones, a hazmat technician with Chemical Biological Radiological Nuclear Platoon, Combat Logistics Regiment 4, 4th Marine Logistics Group, Marine Forces Reserve, during a joint operations training exercise at Volunteer Training Site, Catoosa, Tunnel Hill, Ga., April 8, 2017. The exercise concluded by combining the CBRN Marines with the PRP Marines to practice what they would need to do if a deceased service member was contaminated and needed to be returned home. (U.S. Marine Corps photo by Cpl. Devan Alonzo Barnett/Released)

TUNNEL HILL, Ga. – Staff Sgt. Jarrod Tepe, a platoon sergeant with Personal Retrieval and Processing Company, Combat Logistics Regiment 45, 4th Marine Logistics Group, Marine Forces Reserve, gets decontaminated and sprayed down by Lance Cpl. Jacob Jones, a hazmat technician with Chemical Biological Radiological Nuclear Platoon, Combat Logistics Regiment 4, 4th Marine Logistics Group, Marine Forces Reserve, during a joint operations training exercise at Volunteer Training Site, Catoosa, Tunnel Hill, Ga., April 8, 2017. The exercise concluded by combining the CBRN Marines with the PRP Marines to practice what they would need to do if a deceased service member was contaminated and needed to be returned home. (U.S. Marine Corps photo by Cpl. Devan Alonzo Barnett/Released)

Photo by Cpl. Devan Alonzo Barnett

TUNNEL HILL, Ga. – Lance Cpl. Steven Tran, a Personnel Retrieval and Processing Marine with PRP Company, Combat Logistics Regiment 45, 4th Marine Logistics Group, Marine Forces Reserve, writes down the information of a deceased service member during a joint operations training exercise at Volunteer Training Site, Catoosa, Tunnel Hill, Ga., April 8, 2017. The exercise concluded by combining Chemical Biological Radiological Nuclear Marines with the PRP Marines to practice what they would need to do if a deceased service member was contaminated and needed to be returned home. (U.S. Marine Corps photo by Cpl. Devan Alonzo Barnett/Released)

TUNNEL HILL, Ga. – Lance Cpl. Steven Tran, a Personnel Retrieval and Processing Marine with PRP Company, Combat Logistics Regiment 45, 4th Marine Logistics Group, Marine Forces Reserve, writes down the information of a deceased service member during a joint operations training exercise at Volunteer Training Site, Catoosa, Tunnel Hill, Ga., April 8, 2017. The exercise concluded by combining Chemical Biological Radiological Nuclear Marines with the PRP Marines to practice what they would need to do if a deceased service member was contaminated and needed to be returned home. (U.S. Marine Corps photo by Cpl. Devan Alonzo Barnett/Released)

Photo by Cpl. Devan Alonzo Barnett

TUNNEL HILL, Ga. – Marines with Personnel Retrieval and Processing Company, Combat Logistics Regiment 45, 4th Marine Logistics Group, Marine Forces Reserve, writes down the information of a deceased service member during a joint operations training exercise at Volunteer Training Site, Catoosa, Tunnel Hill, Ga., April 8, 2017. The exercise concluded by combining Chemical Biological Radiological Nuclear Marines with the PRP Marines to practice what they would need to do if a deceased service member was contaminated and needed to be returned home. (U.S. Marine Corps photo by Cpl. Devan Alonzo Barnett/Released)

TUNNEL HILL, Ga. – Marines with Personnel Retrieval and Processing Company, Combat Logistics Regiment 45, 4th Marine Logistics Group, Marine Forces Reserve, writes down the information of a deceased service member during a joint operations training exercise at Volunteer Training Site, Catoosa, Tunnel Hill, Ga., April 8, 2017. The exercise concluded by combining Chemical Biological Radiological Nuclear Marines with the PRP Marines to practice what they would need to do if a deceased service member was contaminated and needed to be returned home. (U.S. Marine Corps photo by Cpl. Devan Alonzo Barnett/Released)

Photo by Cpl. Devan Alonzo Barnett

TUNNEL HILL, Ga. - Lance Cpl. Tyler Kuehn, a hazmat technician with Chemical Biological Radiological Nuclear Platoon, Combat Logistics Regiment 4, 4th Marine Logistics Group, Marine Forces Reserve, adjusts his gas mask during a CBRN training exercise at Volunteer Training Site, Catoosa, Tunnel Hill, Ga., April 4, 2017. The CBRN Marines check their masks every time they put on any of their suits to ensure their mask will provide clean oxygen for up to an hour while they are in an unknown area. (U.S. Marine Corps photo by Cpl. Devan Alonzo Barnett/Released)

TUNNEL HILL, Ga. - Lance Cpl. Tyler Kuehn, a hazmat technician with Chemical Biological Radiological Nuclear Platoon, Combat Logistics Regiment 4, 4th Marine Logistics Group, Marine Forces Reserve, adjusts his gas mask during a CBRN training exercise at Volunteer Training Site, Catoosa, Tunnel Hill, Ga., April 4, 2017. The CBRN Marines check their masks every time they put on any of their suits to ensure their mask will provide clean oxygen for up to an hour while they are in an unknown area. (U.S. Marine Corps photo by Cpl. Devan Alonzo Barnett/Released)

Photo by Cpl. Devan Alonzo Barnett

TUNNEL HILL, Ga. – Cpl. Bryan Griemeverslues, a hazmat technician with Chemical Biological Radiological Nuclear Platoon, Combat Logistics Regiment 4, 4th Marine Logistics Group, Marine Forces Reserve, documents a potentially dangerous building during a CBRN training exercise at Volunteer Training Site, Catoosa, Tunnel Hill, Ga., April 4, 2017. While in an area where the circumstances of the environment are unknown, the CBRN Marines document everything they see because they are the first reconnaissance team to access the area. Photos and sketch pads are used to document details collected from every room to brief the rest of their platoon after they return to the combat operations center. (U.S. Marine Corps photo by Cpl. Devan Alonzo Barnett/Released)

TUNNEL HILL, Ga. – Cpl. Bryan Griemeverslues, a hazmat technician with Chemical Biological Radiological Nuclear Platoon, Combat Logistics Regiment 4, 4th Marine Logistics Group, Marine Forces Reserve, documents a potentially dangerous building during a CBRN training exercise at Volunteer Training Site, Catoosa, Tunnel Hill, Ga., April 4, 2017. While in an area where the circumstances of the environment are unknown, the CBRN Marines document everything they see because they are the first reconnaissance team to access the area. Photos and sketch pads are used to document details collected from every room to brief the rest of their platoon after they return to the combat operations center. (U.S. Marine Corps photo by Cpl. Devan Alonzo Barnett/Released)

Photo by Cpl. Devan Alonzo Barnett