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Corporal Benjamin Stoflet, a field radio operator, assigned to Communications Company, Headquarters Battalion, 1st Marine Division, watches for simulated enemy contacts during phase three of Mountain Warfare Training Exercise 5-15 aboard Marine Corps Mountain Warfare Training Center Bridgeport, Calif., Sept. 21, 2015. Headquarters Battalion acted as the opposing force against 1st Battalion, 6th Marine Regiment, 2nd Marine Division for the field training exercise to give the Marines a realistic look at fighting in a mountainous terrain. (U.S. Marine Corps photo by Cpl. Will Perkins/Released) - Corporal Benjamin Stoflet, a field radio operator, assigned to Communications Company, Headquarters Battalion, 1st Marine Division, watches for simulated enemy contacts during phase three of Mountain Warfare Training Exercise 5-15 aboard Marine Corps Mountain Warfare Training Center Bridgeport, Calif., Sept. 21, 2015. Headquarters Battalion acted as the opposing force against 1st Battalion, 6th Marine Regiment, 2nd Marine Division for the field training exercise to give the Marines a realistic look at fighting in a mountainous terrain. (U.S. Marine Corps photo by Cpl. Will Perkins/Released)

Lieutenant Colonel Brian S. Middleton, commanding officer of 3rd Battalion, 4th Marines, 7th Marine Regiment, 1st Marine Division, salutes the colors during the unit’s reactivation ceremony aboard Marine Air Ground Combat Center Twentynine Palms, Calif., Sept. 17, 2015. The Marine Corps’ reactivation of the “Thundering Third” officially starts Oct. 1, 2015, which marks exactly 90 years of dedicated service within the Corps. - Lieutenant Colonel Brian S. Middleton, commanding officer of 3rd Battalion, 4th Marines, 7th Marine Regiment, 1st Marine Division, salutes the colors during the unit’s reactivation ceremony aboard Marine Air Ground Combat Center Twentynine Palms, Calif., Sept. 17, 2015. The Marine Corps’ reactivation of the “Thundering Third” officially starts Oct. 1, 2015, which marks exactly 90 years of dedicated service within the Corps.

The 1st Marine Division Band plays music before the start of 3rd Battalion, 4th Marines, 7th Marine Regiment’s reactivation ceremony at Lance Cpl. Torrey L. Gray Field, Sept. 17, 2015. - The 1st Marine Division Band plays music before the start of 3rd Battalion, 4th Marines, 7th Marine Regiment’s reactivation ceremony at Lance Cpl. Torrey L. Gray Field, Sept. 17, 2015.

1st Marine Division Logo - 1st Marine Division Logo

1st Marine Division Logo - 1st Marine Division Logo

1st Marine Division Logo - 1st Marine Division Logo

Major Gen. Daniel J. O’Donohue (right), the new commanding general of 1st Marine Division, hands the unit’s colors to Sgt. Maj. William T. Sowers (left), division’s sergeant major, during the change of command ceremony in which Brig. Gen. Daniel D. Yoo passed command to O’Donohue aboard Marine Corps Base Camp Pendleton, Calif., Sept. 10, 2015. O’Donohue is taking command of the division after recently commanding Marine Corps Forces Cyberspace Command. (U.S. Marine Corps photo by Staff Sgt. Bobbie A. Curtis) - Major Gen. Daniel J. O’Donohue (right), the new commanding general of 1st Marine Division, hands the unit’s colors to Sgt. Maj. William T. Sowers (left), division’s sergeant major, during the change of command ceremony in which Brig. Gen. Daniel D. Yoo passed command to O’Donohue aboard Marine Corps Base Camp Pendleton, Calif., Sept. 10, 2015. O’Donohue is taking command of the division after recently commanding Marine Corps Forces Cyberspace Command. (U.S. Marine Corps photo by Staff Sgt. Bobbie A. Curtis)

Marines with Alpha Company, 1st Battalion, 5th Marine Regiment provide security on the beach following an amphibious landing as part of Exercise Dawn Blitz 2015 at Marine Corps Base Camp Pendleton, Calif., Sept. 5, 2015. Dawn Blitz is a multinational, amphibious training exercise designed to hone the amphibious landing skills of I Marine Expeditionary Brigade, Expeditionary Strike Group Three and allies of the United States. - Marines with Alpha Company, 1st Battalion, 5th Marine Regiment provide security on the beach following an amphibious landing as part of Exercise Dawn Blitz 2015 at Marine Corps Base Camp Pendleton, Calif., Sept. 5, 2015. Dawn Blitz is a multinational, amphibious training exercise designed to hone the amphibious landing skills of I Marine Expeditionary Brigade, Expeditionary Strike Group Three and allies of the United States.

Marines assigned to Communications Company, Headquarters Battalion, 1st Marine Division, belay Marines while practicing rock climbing operations during phase two of Mountain Warfare Training Exercise 5-15 aboard Marine Corps Mountain Warfare Training Center Bridgeport, Calif., Sept. 10, 2015. The training covered maneuvering throughout mountainous terrain features by rope climbing and rappelling as well as surviving in the rugged environment. (U.S. Marine Corps photo by Cpl. Will Perkins/Released) - Marines assigned to Communications Company, Headquarters Battalion, 1st Marine Division, belay Marines while practicing rock climbing operations during phase two of Mountain Warfare Training Exercise 5-15 aboard Marine Corps Mountain Warfare Training Center Bridgeport, Calif., Sept. 10, 2015. The training covered maneuvering throughout mountainous terrain features by rope climbing and rappelling as well as surviving in the rugged environment. (U.S. Marine Corps photo by Cpl. Will Perkins/Released)

Marines assigned to Headquarters Company, Headquarters Battalion, 1st Marine Division are taught the proper method of fastening a Marine to a litter system during phase one of Mountain Warfare Training Exercise 5-15 aboard Marine Corps Mountain Warfare Training Center Bridgeport, Calif., Sept. 6, 2015. Phase one of MTNEX required the Marines and Sailors to participate in hands-on instruction which gave them the necessary skills used to conduct the rest of the exercise and to survive the austere, mountainous environment. (U.S. Marine Corps photo by Cpl. Will Perkins/Released) - Marines assigned to Headquarters Company, Headquarters Battalion, 1st Marine Division are taught the proper method of fastening a Marine to a litter system during phase one of Mountain Warfare Training Exercise 5-15 aboard Marine Corps Mountain Warfare Training Center Bridgeport, Calif., Sept. 6, 2015. Phase one of MTNEX required the Marines and Sailors to participate in hands-on instruction which gave them the necessary skills used to conduct the rest of the exercise and to survive the austere, mountainous environment. (U.S. Marine Corps photo by Cpl. Will Perkins/Released)