U.S. Marine Lance Cpl. Zane Harmon fast ropes from a tower aboard Marine Corps Base Hawaii, May 12, 2015. Harmon is part of the 15th Marine Expeditionary Unit’s Maritime Raid Force security element. These Marines practice fast roping to ensure they are prepared for any type of mission during deployment. (U.S. Marine Corps photo by Cpl. Anna Albrecht/Released) - U.S. Marine Lance Cpl. Zane Harmon fast ropes from a tower aboard Marine Corps Base Hawaii, May 12, 2015. Harmon is part of the 15th Marine Expeditionary Unit’s Maritime Raid Force security element. These Marines practice fast roping to ensure they are prepared for any type of mission during deployment. (U.S. Marine Corps photo by Cpl. Anna Albrecht/Released)

U.S. Marines with the 15th Marine Expeditionary Unit’s Maritime Raid Force security element fast rope out of a CH-53E Super Stallion aboard Marine Corps Base Hawaii, May 12, 2015. Fast roping gives the MRF the ability to rapidly insert combat forces onto an objective. (U.S. Marine Corps photo by Cpl. Anna Albrecht/Released) - U.S. Marines with the 15th Marine Expeditionary Unit’s Maritime Raid Force security element fast rope out of a CH-53E Super Stallion aboard Marine Corps Base Hawaii, May 12, 2015. Fast roping gives the MRF the ability to rapidly insert combat forces onto an objective. (U.S. Marine Corps photo by Cpl. Anna Albrecht/Released)

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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.

U.S. Marines with the 15th Marine Expeditionary Unit’s Maritime Raid Force prepare to disembark the USS Essex during Amphibious Squadron/Marine Expeditionary Unit Integration Training off the coast of San Diego March 4, 2015. These Marines are practicing a variety of full-mission profiles so they are well-prepared for anything that comes up during their deployment. - U.S. Marines with the 15th Marine Expeditionary Unit’s Maritime Raid Force prepare to disembark the USS Essex during Amphibious Squadron/Marine Expeditionary Unit Integration Training off the coast of San Diego March 4, 2015. These Marines are practicing a variety of full-mission profiles so they are well-prepared for anything that comes up during their deployment.

U.S. Marine Pfc. Cody Dunlap throws a simulated grenade during squad tactics and maneuver training aboard Camp Pendleton, Calif., Jan. 26, 2015. Dunlap is an automatic rifleman with Kilo Company, Battalion Landing Team 3rd Battalion, 1st Marine Regiment, 15th Marine Expeditionary Unit. As the ground combat element for the 15th MEU, BLT 3/1 is preparing for their upcoming deployment by enhancing their combat skills and learning to work as a cohesive unit. - U.S. Marine Pfc. Cody Dunlap throws a simulated grenade during squad tactics and maneuver training aboard Camp Pendleton, Calif., Jan. 26, 2015. Dunlap is an automatic rifleman with Kilo Company, Battalion Landing Team 3rd Battalion, 1st Marine Regiment, 15th Marine Expeditionary Unit. As the ground combat element for the 15th MEU, BLT 3/1 is preparing for their upcoming deployment by enhancing their combat skills and learning to work as a cohesive unit.

U.S. Marine Pfc. Jacob Piazza, right, fires a .50-caliber machine gun at targets during realistic urban training aboard Camp Roberts, Calif., Dec. 14, 2014. Piazza is a rifleman with Weapons Company, Battalion Landing Team 3rd Battalion, 1st Marine Regiment, 15th Marine Expeditionary Unit. The training prepares the 15th MEU’s Marines for their upcoming deployment, enhancing their combat skills in environments similar to those they may find in future missions. - U.S. Marine Pfc. Jacob Piazza, right, fires a .50-caliber machine gun at targets during realistic urban training aboard Camp Roberts, Calif., Dec. 14, 2014. Piazza is a rifleman with Weapons Company, Battalion Landing Team 3rd Battalion, 1st Marine Regiment, 15th Marine Expeditionary Unit. The training prepares the 15th MEU’s Marines for their upcoming deployment, enhancing their combat skills in environments similar to those they may find in future missions.

U.S Marine Sgt. Eric Maehler holds security while conducting a raid during realistic urban training at Dodger Stadium in Los Angeles Dec. 8, 2014. Maehler is a team leader with the 15th Marine Expeditionary Unit’s Maritime Raid Force. RUT prepares the Marines of the 15th MEU for their upcoming deployment by enhancing their combat skills in environments they may encounter in future missions. (U.S. Marine Corps photo by Cpl. Anna Albrecht/Released) - U.S Marine Sgt. Eric Maehler holds security while conducting a raid during realistic urban training at Dodger Stadium in Los Angeles Dec. 8, 2014. Maehler is a team leader with the 15th Marine Expeditionary Unit’s Maritime Raid Force. RUT prepares the Marines of the 15th MEU for their upcoming deployment by enhancing their combat skills in environments they may encounter in future missions. (U.S. Marine Corps photo by Cpl. Anna Albrecht/Released)

U.S. Marines with the 15th Marine Expeditionary Unit’s Maritime Raid Force conduct a raid during realistic urban training aboard Camp San Luis Obispo, Calif., Dec. 5, 2014. RUT prepares the Marines of the 15th MEU for their upcoming deployment, enhancing their combat skills in environments similar to those they may find in future missions. (U.S. Marine Corps photo by Cpl. Anna Albrecht/Released) - U.S. Marines with the 15th Marine Expeditionary Unit’s Maritime Raid Force conduct a raid during realistic urban training aboard Camp San Luis Obispo, Calif., Dec. 5, 2014. RUT prepares the Marines of the 15th MEU for their upcoming deployment, enhancing their combat skills in environments similar to those they may find in future missions. (U.S. Marine Corps photo by Cpl. Anna Albrecht/Released)

U.S. Marine Sgt. Andy Muller aims in during a dry-fire drill at a close-quarters tactics course aboard Camp Pendleton, Calif., Sept. 25, 2014. Muller is a receiver-transmitter operator with Bravo Company, 1st Reconnaissance Battalion. These Marines are enhancing their skills before compositing with the 15th Marine Expeditionary Unit in October. - U.S. Marine Sgt. Andy Muller aims in during a dry-fire drill at a close-quarters tactics course aboard Camp Pendleton, Calif., Sept. 25, 2014. Muller is a receiver-transmitter operator with Bravo Company, 1st Reconnaissance Battalion. These Marines are enhancing their skills before compositing with the 15th Marine Expeditionary Unit in October.

Marines from 3rd Battalion, 1st Marine Division, 1 Marine Expeditionary Force recently conducted training aboard Marine Corps Mountain Warfare Training Center in Bridgeport, Calif., Aug. 18 to Sept. 17, 2014. The month-long exercise trained Marines in many facets all centered on mountaineering skills and high-altitude warfare. Assault climbing, rappelling, horse and mule packing, and small unit movements were all included during the exercise. - Marines from 3rd Battalion, 1st Marine Division, I Marine Expeditionary Force recently conducted training aboard Marine Corps Mountain Warfare Training Center in Bridgeport, California, Aug. 18 to Sept. 17, 2014. The month-long exercise trained Marines in many facets all centered on mountaineering skills and high-altitude warfare. Assault climbing, rappelling, horse and mule packing, and small unit movements were all included during the exercise.