Bougainville I - U.S. Marine Corps Pfc. Julian Gonzalez, rifleman with Echo Co., 2nd Battalion, 3rd Marine Regiment, takes cover on a re-supply patrol during exercise Bougainville I at Kahuku Training Area, Hawaii, March 20, 2019. Bougainville I is a pre-deployment training exercise that enhances the unit’s proficiency, cohesion and combat readiness. (U.S. Marine Corps photo by Lance Cpl. Jacob Wilson)

Petty Officer 1st Class Will Crampton, a first class navy diver with 3rd Reconnaissance Battalion, III Marine Expeditionary Force, monitors Marines inside a Standard Navy Double Lock Hyperbaric Recompression Chamber (SNDLRCS) at Camp Schwab, Okinawa, Japan, Jan. 9, 2019. Crampton observed the Marines to ensure their safety while in a SNDLRCS during a training scenario to simulate the pressure felt when diving up to 60 feet in order to enhance combat readiness. (U.S. Marine Corps photo by Lance Cpl. Hannah Hall/Released) - Petty Officer 1st Class Will Crampton, a first class navy diver with 3rd Reconnaissance Battalion, III Marine Expeditionary Force, monitors Marines inside a Standard Navy Double Lock Hyperbaric Recompression Chamber (SNDLRCS) at Camp Schwab, Okinawa, Japan, Jan. 9, 2019. Crampton observed the Marines to ensure their safety while in a SNDLRCS during a training scenario to simulate the pressure felt when diving up to 60 feet in order to enhance combat readiness. (U.S. Marine Corps photo by Lance Cpl. Hannah Hall/Released)

U.S. Marine Corps Lance Cpl. Johnathan Delgado, a field artillery Marine with 3rd Battalion, 12th Marine Regiment, 3rd Marine Division, fires a M777 Howitzer in the Ojojihara Maneuver Area, Miyagi Prefecture, Japan, Feb. 10, 2019. Marines with 3/12 are training in the Ojojihara Maneuver Area as part of the Artillery Relocation Training Program 18-4. ARTP is a routine training exercise that allows Okinawa-based Marines to conduct live-fire training in Japan. (U.S. Marine Corps photo by Lance Cpl. Christian Ayers) - U.S. Marine Corps Lance Cpl. Johnathan Delgado, a field artillery Marine with 3rd Battalion, 12th Marine Regiment, 3rd Marine Division, fires a M777 Howitzer in the Ojojihara Maneuver Area, Miyagi Prefecture, Japan, Feb. 10, 2019. Marines with 3/12 are training in the Ojojihara Maneuver Area as part of the Artillery Relocation Training Program 18-4. ARTP is a routine training exercise that allows Okinawa-based Marines to conduct live-fire training in Japan. (U.S. Marine Corps photo by Lance Cpl. Christian Ayers)

U.S. Marine Corps Lance Cpl. Johnathan Delgado, a field artillery Marine with 3rd Battalion, 12th Marine Regiment, 3rd Marine Division, fires a M777 Howitzer in the Ojojihara Maneuver Area, Miyagi Prefecture, Japan, Feb. 10, 2019. Marines with 3/12 are training in the Ojojihara Maneuver Area as part of the Artillery Relocation Training Program 18-4. ARTP is a routine training exercise that allows Okinawa-based Marines to conduct live-fire training in Japan. (U.S. Marine Corps photo by Lance Cpl. Christian Ayers) - U.S. Marine Corps Lance Cpl. Johnathan Delgado, a field artillery Marine with 3rd Battalion, 12th Marine Regiment, 3rd Marine Division, fires a M777 Howitzer in the Ojojihara Maneuver Area, Miyagi Prefecture, Japan, Feb. 10, 2019. Marines with 3/12 are training in the Ojojihara Maneuver Area as part of the Artillery Relocation Training Program 18-4. ARTP is a routine training exercise that allows Okinawa-based Marines to conduct live-fire training in Japan. (U.S. Marine Corps photo by Lance Cpl. Christian Ayers)