Noncommissioned officers with the 31st Marine Expeditionary Unit toss medicine balls during a Force Fitness Instructor led High Intensity Tactical Training session at Camp Hansen, Okinawa, Japan, June 8, 2018. The 31st MEU is adopting an NCO-led FFI program to improve overall physical fitness while reducing injury and building unit morale. The 31st MEU, the Marine Corps' only continuously forward-deployed MEU, provides a flexible force ready to perform a wide-range of military operations. - Noncommissioned officers with the 31st Marine Expeditionary Unit toss medicine balls during a Force Fitness Instructor led High Intensity Tactical Training session at Camp Hansen, Okinawa, Japan, June 8, 2018. The 31st MEU is adopting an NCO-led FFI program to improve overall physical fitness while reducing injury and building unit morale. The 31st MEU, the Marine Corps' only continuously forward-deployed MEU, provides a flexible force ready to perform a wide-range of military operations.

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. - 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.

A Marine with Task Force Southwest fires a PK general-purpose machine gun during foreign weapons familiarization training at Marine Corps Base Camp Lejeune, North Carolina, Jan. 17, 2016. Marines with the unit are preparing for an upcoming deployment to Helmand Province, Afghanistan, where they will train, advise and assist the Afghan National Army 215th Corps and 505th Zone National Police to continue building well-equipped defense and security forces. - A Marine with Task Force Southwest fires a PK general-purpose machine gun during foreign weapons familiarization training at Marine Corps Base Camp Lejeune, North Carolina, Jan. 17, 2016. Marines with the unit are preparing for an upcoming deployment to Helmand Province, Afghanistan, where they will train, advise and assist the Afghan National Army 215th Corps and 505th Zone National Police to continue building well-equipped defense and security forces.

A Marine student with the Tactical Air Control Party course, conducted by Expeditionary Warfare Training Group-Atlantic, determines the range of enemy targets during a two-day live-fire exercise at Marine Corps Base Camp Lejeune, N.C., June 20-21, 2016. The five-week course certifies Marines in safely and efficiently employing fixed and rotor-wing aircraft in close proximity to friendly forces. - A Marine student with the Tactical Air Control Party course, conducted by Expeditionary Warfare Training Group-Atlantic, determines the range of enemy targets during a two-day live-fire exercise at Marine Corps Base Camp Lejeune, N.C., June 20-21, 2016. The five-week course certifies Marines in safely and efficiently employing fixed and rotor-wing aircraft in close proximity to friendly forces.

A CH-53E Super Stallion carries an external load during a training exercise at Landing Zone Albatross on Marine Corps Base Camp Lejeune, N.C., June 9, 2016. The purpose of external lifts is to transport large amounts of supplies and heavy gear to areas inaccessible by ground vehicles. - A CH-53E Super Stallion carries an external load during a training exercise at Landing Zone Albatross on Marine Corps Base Camp Lejeune, N.C., June 9, 2016. The purpose of external lifts is to transport large amounts of supplies and heavy gear to areas inaccessible by ground vehicles.

Marines with 3rd Battalion, 10th Marine Regiment, 2nd Marine Division, fire a 155mm M777A2 Light-weight Towed Howitzer in the Black Top Training Area aboard Marine Corps Air Ground Combat Center Twentynine Palms, Calif., May 18, 2016. Various units from 2nd Marine Division participated in Integrated Training Exercise 3-16 in preparation for their deployment with Special Purpose Marine Air Ground Task Force-Crisis Response-Africa. - Marines with 3rd Battalion, 10th Marine Regiment, 2nd Marine Division, fire a 155mm M777A2 Light-weight Towed Howitzer in the Black Top Training Area aboard Marine Corps Air Ground Combat Center Twentynine Palms, Calif., May 18, 2016. Various units from 2nd Marine Division participated in Integrated Training Exercise 3-16 in preparation for their deployment with Special Purpose Marine Air Ground Task Force-Crisis Response-Africa.

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Cpl. Anthony Lubbers, designated marksmanship instructor, Combat Center Marksmanship Training Unit, prepares to breach a door during the Western Regional Combat Match at Marine Corps Air Combat Center, April 8, 2016. - Cpl. Anthony Lubbers, designated marksmanship instructor, Combat Center Marksmanship Training Unit, prepares to breach a door during the Western Regional Combat Match at Marine Corps Air Combat Center, April 8, 2016.

Sgt. Benjamin Hebert, a crew chief with Marine Light Attack Helicopter Squadron 469 based out of Marine Corps Air Station Camp Pendleton, Calif., performs maintenance on a UH-1Y “Venom” helicopter aboard Marine Corps Air Station Yuma, Ariz., Friday, Feb. 5, 2016. - Sgt. Benjamin Hebert, a crew chief with Marine Light Attack Helicopter Squadron 469 based out of Marine Corps Air Station Camp Pendleton, Calif., performs maintenance on a UH-1Y “Venom” helicopter aboard Marine Corps Air Station Yuma, Ariz., Friday, Feb. 5, 2016.

Lance Cpl. Cary Chafton, a rifleman with 2nd Light Armored Reconnaissance Battalion gives directions to his squad during a patrolling exercise at Marine Corps Base Camp Lejeune, N.C., Dec 15, 2015. The unit practiced patrolling techniques and set up patrol bases to maintain readiness. - Lance Cpl. Cary Chafton, a rifleman with 2nd Light Armored Reconnaissance Battalion gives directions to his squad during a patrolling exercise at Marine Corps Base Camp Lejeune, N.C., Dec 15, 2015. The unit practiced patrolling techniques and set up patrol bases to maintain readiness.

Marines with II Marine Expeditionary Force practice loading and unloading inert rounds into the Non-Lethal, Tube-Launched Munitions System during their practical application training at Camp Lejeune, North Carolina, Aug. 14, 2014. Marine Corps Systems Command Optics and Non-Lethal Systems is fielding the system that sends non-lethal munitions out as far as 500 meters and uses an audible bang to deter a crowd or a person with mal-intent. Its intended use is for military checkpoints. - Marines with II Marine Expeditionary Force practice loading and unloading inert rounds into the Non-Lethal, Tube-Launched Munitions System during their practical application training at Camp Lejeune, North Carolina, Aug. 14, 2014. Marine Corps Systems Command Optics and Non-Lethal Systems is fielding the system that sends non-lethal munitions out as far as 500 meters and uses an audible bang to deter a crowd or a person with mal-intent. Its intended use is for military checkpoints.