A Marine with 3rd Battalion, 6th Marine Regiment throws a simulated grenade during lane training at Marine Corps Base Camp Lejeune, N.C., Oct. 20, 2015. Marines with the company were required to assault a bunker and when within range, throw a grenade to eliminate any possible threats. The training consisted of four stations, each of which would provide instructions and hands-on training in radio communications, grenade employment, patrolling and emplacing M18 Claymores. - A Marine with 3rd Battalion, 6th Marine Regiment throws a simulated grenade during lane training at Marine Corps Base Camp Lejeune, N.C., Oct. 20, 2015. Marines with the company were required to assault a bunker and when within range, throw a grenade to eliminate any possible threats. The training consisted of four stations, each of which would provide instructions and hands-on training in radio communications, grenade employment, patrolling and emplacing M18 Claymores.

Marines from Battery M, 3rd Battalion, 14th Marine Regiment, 4th Marine Division, fire the M240 machine gun at targets down range at Pelham Range in Anniston, Ala., on Sept. 19, 2015. The Marines attended training to hone skills and increase their proficiency in crew-served weapons systems. - Marines from Battery M, 3rd Battalion, 14th Marine Regiment, 4th Marine Division, fire the M240 machine gun at targets down range at Pelham Range in Anniston, Ala., on Sept. 19, 2015. The Marines attended training to hone skills and increase their proficiency in crew-served weapons systems.

Marines with 3rd Battalion, 5th Marine Regiment, 1st Marine Division, establish security during a helicopter raid, as part of the Marine Corps Combat Readiness Evaluation (MCCRE), aboard Marine Corps Base Camp Pendleton, Calif., Aug. 4, 2015. The MCCRE is used evaluate the operational readiness of a designated unit. - Marines with 3rd Battalion, 5th Marine Regiment, 1st Marine Division, establish security during a helicopter raid, as part of the Marine Corps Combat Readiness Evaluation (MCCRE), aboard Marine Corps Base Camp Pendleton, Calif., Aug. 4, 2015. The MCCRE is used evaluate the operational readiness of a designated unit.

A Marine Corps rifle team fires the three-volley salute for Gunnery Sgt. Thomas J. Sullivan’s funeral July 27, 2015, at Veterans Memorial Cemetery in Agawan, Massachusetts. Sullivan was one of five victims of the Chattanooga, Tennessee shootings July 16, 2015. Sullivan was described by his family and fellow Marines as a Marines Marine, and always had a quirky smile that resembled a kid in a candy store. - A Marine Corps rifle team fires the three-volley salute for Gunnery Sgt. Thomas J. Sullivan’s funeral July 27, 2015, at Veterans Memorial Cemetery in Agawan, Massachusetts. Sullivan was one of five victims of the Chattanooga, Tennessee shootings July 16, 2015. Sullivan was described by his family and fellow Marines as a Marines Marine, and always had a quirky smile that resembled a kid in a candy store.

Lt. Gen. Richard P. Mills, commander of Marine Forces Reserve, presents a folded flag to the widow of Sgt. Carson Holmquist, a motor transport maintenance chief with Battery M, 3rd Battalion, 14th Marine Regiment, 4th Marine Division, Marine Forces Reserve, during his funeral July 25, 2015 in Grantsburg, Wisconsin. Holmquist, along with three other Marines and a sailor, was killed in an attack at the Naval Operation Support Center and Marine Corps Reserve Center in Chattanooga, Tennesee July 16, 2015. Marines, family, friends and the community of Grantsburg gathered to honor the memory and sacrifice of Holmquist and his fallen brothers-in-arms. - Lt. Gen. Richard P. Mills, commander of Marine Forces Reserve, presents a folded flag to the widow of Sgt. Carson Holmquist, a motor transport maintenance chief with Battery M, 3rd Battalion, 14th Marine Regiment, 4th Marine Division, Marine Forces Reserve, during his funeral July 25, 2015 in Grantsburg, Wisconsin. Holmquist, along with three other Marines and a sailor, was killed in an attack at the Naval Operation Support Center and Marine Corps Reserve Center in Chattanooga, Tennesee July 16, 2015. Marines, family, friends and the community of Grantsburg gathered to honor the memory and sacrifice of Holmquist and his fallen brothers-in-arms.

U.S. Marine Sgt. Erik Maehler, left, demonstrates loading a M9 Beretta pistol to Hospital Corpsman 1st Class Sunshine Padilla aboard the amphibious assault ship USS Essex (LHD 2). Maehler is a member of the 15th Marine Expeditionary Unit’s Maritime Raid Force and Padilla is a hospital corpsman with Marine Medium Tiltrotor Squadron 161 (Reinforced), 15th MEU. The Marines practice marksmanship fundamentals dry to ensure safety and accuracy when shooting. The 15th MEU is embarked on the Essex Amphibious Ready Group and deployed to maintain regional security in the U.S. 5th Fleet area of operations. - U.S. Marine Sgt. Erik Maehler, left, demonstrates loading a M9 Beretta pistol to Hospital Corpsman 1st Class Sunshine Padilla aboard the amphibious assault ship USS Essex (LHD 2). Maehler is a member of the 15th Marine Expeditionary Unit’s Maritime Raid Force and Padilla is a hospital corpsman with Marine Medium Tiltrotor Squadron 161 (Reinforced), 15th MEU. The Marines practice marksmanship fundamentals dry to ensure safety and accuracy when shooting. The 15th MEU is embarked on the Essex Amphibious Ready Group and deployed to maintain regional security in the U.S. 5th Fleet area of operations.

Corporal Russell Robertson, a squad leader assigned to Company I, 3rd Battalion, 5th Marine Regiment, extends the antenna for his radio operator during the 1st Marine Division Super Squad Competition aboard Marine Corps Base Camp Pendleton, Calif., June 30, 2015. The Marines and Sailors tested their abilities to conduct infantry operations for the title of super squad. - Corporal Russell Robertson, a squad leader assigned to Company I, 3rd Battalion, 5th Marine Regiment, extends the antenna for his radio operator during the 1st Marine Division Super Squad Competition aboard Marine Corps Base Camp Pendleton, Calif., June 30, 2015. The Marines and Sailors tested their abilities to conduct infantry operations for the title of super squad.

A corpsman, left, with 3rd Battalion, 8th Marine Regiment, treats a simulated injury on a Marine roleplaying as a pilot, June 10, at Marine Corps Base Camp Lejeune, N.C., during a Tactical Recovery of Aircraft and Personnel course. For a TRAP mission, a platoon of Marines is flown into an objective area, where they secure the area before locating a downed aircraft and its personnel to bring them back to safety. Expeditionary Operations Training Group, II Marine Expeditionary Force, conducted the course as an evaluation for Marines with 3/8, and with Marine Heavy Helicopter Squadron 461, Marine Aircraft Group 29, 2nd Marine Aircraft Wing, in preparation for upcoming deployments. - A corpsman, left, with 3rd Battalion, 8th Marine Regiment, treats a simulated injury on a Marine roleplaying as a pilot, June 10, at Marine Corps Base Camp Lejeune, N.C., during a Tactical Recovery of Aircraft and Personnel course. For a TRAP mission, a platoon of Marines is flown into an objective area, where they secure the area before locating a downed aircraft and its personnel to bring them back to safety. Expeditionary Operations Training Group, II Marine Expeditionary Force, conducted the course as an evaluation for Marines with 3/8, and with Marine Heavy Helicopter Squadron 461, Marine Aircraft Group 29, 2nd Marine Aircraft Wing, in preparation for upcoming deployments.

U.S. Navy Petty Officer 3rd Class Guillermo Lopez, with Combat Logistics Battalion 15, 15th Marine Expeditionary Unit, provides medical attention to a distressed mariner aboard the USS Rushmore (LSD 47) at sea in the Pacific Ocean, June 10, 2015. Rushmore rendered assistance to the distressed mariners in the waters between the Indonesian islands of Kalimantan and Sulawesi. Once on board, evacuees were provided food and medical attention by Marines and sailors of the 15th Marine Expeditionary Unit and Essex Amphibious Ready Group. - U.S. Navy Petty Officer 3rd Class Guillermo Lopez, with Combat Logistics Battalion 15, 15th Marine Expeditionary Unit, provides medical attention to a distressed mariner aboard the USS Rushmore (LSD 47) at sea in the Pacific Ocean, June 10, 2015. Rushmore rendered assistance to the distressed mariners in the waters between the Indonesian islands of Kalimantan and Sulawesi. Once on board, evacuees were provided food and medical attention by Marines and sailors of the 15th Marine Expeditionary Unit and Essex Amphibious Ready Group.

Pfc. Michael Ainsworth, a mortarman with Weapons Company, 3rd Battalion, 5th Marine Regiment adjusts the sights of the 81 mm mortar system during a combined-arms raid at Army National Training Center Fort Irwin, California April 11, 2015. The raid was conducted by 1st Light Armored Reconnaissance Battalion as part of exercise Desert Scimitar 2015. - Pfc. Michael Ainsworth, a mortarman with Weapons Company, 3rd Battalion, 5th Marine Regiment adjusts the sights of the 81 mm mortar system during a combined-arms raid at Army National Training Center Fort Irwin, California April 11, 2015. The raid was conducted by 1st Light Armored Reconnaissance Battalion as part of exercise Desert Scimitar 2015.

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Marines from Company I, 3rd Battalion, 1st Marine Regiment depart from an MV-22B Osprey to conduct a simulated embassy reinforcement training exercise at Joint Reserve Training Center Los Alamitos, California, April 11, 2015. The embassy reinforcement operation was a part of the 15th Marine Expeditionary Unit’s certification exercise, the last training exercise the MEU conducts before deployment. - Marines from Company I, 3rd Battalion, 1st Marine Regiment depart from an MV-22B Osprey to conduct a simulated embassy reinforcement training exercise at Joint Reserve Training Center Los Alamitos, California, April 11, 2015. The embassy reinforcement operation was a part of the 15th Marine Expeditionary Unit’s certification exercise, the last training exercise the MEU conducts before deployment.

Lance Cpl. David Wadleigh, military working dog handler, Military Working Dog Platoon, 1st Law Enforcement Battalion, posts security during the patrol with his dog, Hugo. Marines with MWD Platoon, 1st LEB and Assault Breacher Vehicle Platoon, Alpha Company, 1st Combat Engineers Battalion, participated in Counter Improvised Explosive Device Training aboard Camp Pendleton, Calif., March 10, 2015. - Lance Cpl. David Wadleigh, military working dog handler, Military Working Dog Platoon, 1st Law Enforcement Battalion, posts security during the patrol with his dog, Hugo. Marines with MWD Platoon, 1st LEB and Assault Breacher Vehicle Platoon, Alpha Company, 1st Combat Engineers Battalion, participated in Counter Improvised Explosive Device Training aboard Camp Pendleton, Calif., March 10, 2015.