U.S. Navy HM3 Ruben De La Torre, a corpsman with 1st Battalion, 5th Marine Regiment, 1st Marine Division, posts security during the Marine Corps Combat Readiness Evaluation (MCCRE) on Marine Corps Base Camp Pendleton, California, Sept. 21, 2019. 5th Marines conducted a regimental-sized MCCRE that included 1st Battalion, 5th Marines, 2nd Battalion, 5th Marines, and the Regimental Headquarters to increase the combat proficiency and readiness of the regiment. The MCCRE took place over a 10-day period and served as a proof of concept for future regimental-sized MCCREs. (U.S. Marine Corps photo by Lance Cpl. Alexa M. Hernandez)

U.S. Marines and a U.S. Navy Corpsman with 1st Battalion, 5th Marine Regiment, participate in a simulated casualty evacuation during the Marine Corps Combat Readiness Evaluation (MCCRE) on Marine Corps Base Camp Pendleton, California, Sept. 18, 2019. 5th Marines conducted a regimental-sized MCCRE that included 1st Battalion, 5th Marines, 2nd Battalion, 5th Marines, and the Regimental Headquarters to increase the combat proficiency and readiness of the regiment. The MCCRE took place over a 10-day period and served as a proof of concept for future regimental-sized MCCREs. (U.S. Marine Corps photo by Lance Cpl. Alexa M. Hernandez)

U.S. Marines with Charlie Company, 1st Battalion, 5th Marine Regiment, 1st Marine Division, hike up a hill during the Marine Corps Combat Readiness Evaluation (MCCRE) on Marine Corps Base Camp Pendleton, California, Sept. 23, 2019. 5th Marines conducted a regimental-sized MCCRE for 1st Battalion, 5th Marines and 2nd Battalion, 5th Marines, as well as the Regimental Headquarters to increase the combat proficiency and readiness of the regiment. The MCCRE took place over a 10 day period and served as proof of concept for future regimental-sized MCCREs. (U.S. Marine Corps photo by Lance Cpl. Alexa M. Hernandez)

U.S Marines and Sailors with Echo Company, 2nd battalion, 4th Marine Regiment, 1st Marine Division conduct Bastard FEX III at Marine Corps Base Camp Pendleton, Aug. 14, 2019. Bastard FEX III is an opportunity for the Marines to conduct offensive and defensive operations at the platoon and company levels in preparation for future deployments. (U.S. Marine Corps video by Sgt. Mason Roy)

U.S. Marine Corps Staff Sgt. Shane Armstrong, an artillery cannon operator with 5th Battalion, 11th Marine Regiment, 1st Marine Division, checks a stack of M270 rockets during exercise Steel Knight (SK) 19 at Marine Corps Base Camp Pendleton, California, Dec. 7, 2018. SK19 is an annual training exercise and assesses the 1st Marine Division’s ability to conduct ground combat operations against a peer or near-peer adversary. The exercise challenges the division’s commanders, staff, and units in a dynamic scenario against a reactive and opposing force to refine the units’ command and control, interoperability, and fundamental warfighting skills. (U.S. Marine Corps photo by Cpl. Audrey M. C. Rampton)

A U.S. Marine Corps M142 High-mobility artillery rocket system fires a M270 rocket during exercise Steel Knight (SK) 19 at Army Facility Dugway Proving Ground, Utah, Dec. 7, 2018. SK19 is an annual training exercise and assesses the 1st Marine Division’s ability to conduct ground combat operations against a peer or near-peer adversary. The exercise challenges the division’s commanders, staff, and units in a dynamic scenario against a reactive and opposing force to refine the units’ command and control, interoperability, and fundamental warfighting skills. (U.S. Marine Corps photo by Cpl. Audrey M. C. Rampton)

U.S. Marine Corps Cpl. Ramon Trevino, an infantry Marine with 1st Battalion, 5th Marine Regiment, participates in a decontamination drill during Steel Knight 2019 (SK19) on Marine Corps Air Ground Combat Center, Twentynine Palms, Calif., Dec. 06, 2018. SK19 is an annual training exercise and assesses the 1st Marine Division’s ability to conduct ground combat operations against a peer or near-peer adversary. The exercise challenges the division’s commanders, staff, and units in a dynamic scenario against a reactive and opposing force to refine the units’ command and control, interoperability, and fundamental warfighting skills. (U.S. Marine Corps photo by Cpl. Rhita Daniel)

U.S. Marine Corps LCpl. Jeremy Yeager, a machine gunner with 1st Battalion, 5th Marine Regiment, participates in a simulated air assault during Steel Knight 2019 (SK19) on Marine Corps Air Ground Combat Center, Twentynine Palms, Calif., Dec. 05, 2018. SK19 is an annual training exercise and assesses the 1st Marine Division’s ability to conduct ground combat operations against a peer or near-peer adversary. The exercise challenges the division’s commanders, staff, and units in a dynamic scenario against a reactive and opposing force to refine the units’ command and control, interoperability, and fundamental warfighting skills. (U.S. Marine Corps photo by Cpl. Rhita Daniel)

U.S. Marines with 1st Battalion, 5th Marine Regiment, participate in a simulated air assault during Steel Knight 2019 (SK19) on Marine Corps Air Ground Combat Center, Twentynine Palms, Calif., Dec. 05, 2018. SK19 is an annual training exercise and assesses the 1st Marine Division’s ability to conduct ground combat operations against a peer or near-peer adversary. The exercise challenges the division’s commanders, staff, and units in a dynamic scenario against a reactive and opposing force to refine the units’ command and control, interoperability, and fundamental warfighting skills. (U.S. Marine Corps photo by Cpl. Rhita Daniel)

U.S. Marine Corps Cpl. Ramon Trevino, an infantry Marine with 1st Battalion, 5th Marine Regiment, participates in a training flight in preparation for Steel Knight 2019 on Marine Corps Base Camp Pendleton, Calif., Nov. 27, 2018. SK19 is an annual training exercise and assesses the 1st Marine Division’s ability to conduct ground combat operations against a peer or near-peer adversary. The exercise challenges the division’s commanders, staff, and units in a dynamic scenario against a reactive and opposing force to refine the units’ command and control, interoperability, and fundamental warfighting skills. (U.S. Marine Corps photo by Cpl. Rhita Daniel)

A U.S. Marine with the 1st Battalion, 5th Marine Regiment participates in a training flight in preparation for Steel Knight 2019 on Marine Corps Base Camp Pendleton, Nov. 27, 2018. SK19 is an annual training exercise and assesses the 1st marine Division’s ability to conduct ground combat operations against a peer or near-peer adversary. The exercise challenges the division’s commanders, staff, and units in a dynamic in a dynamic scenario against a reactive and thinking opposing force to refine the units’ command and control, interoperability, and fundamental warfighting skills. (U.S. Marine Corps photo by Cpl. Rhita Daniel)