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.