Lt. Gen. Rex C. McMillian, commander of Marine Forces Reserve, speaks to the Reserve Marines attending Integrated Training Exercise 4-16 at Marine Corps Air Ground Combat Center Twentynine Palms, California, June 19, 2016. Over the two-week period the Marines trained in combined-arms exercises to hone their skills as a Marine Air Ground Task Force, in order to prepare for worldwide deployment and augment the active component. - Lt. Gen. Rex C. McMillian, commander of Marine Forces Reserve, speaks to the Reserve Marines attending Integrated Training Exercise 4-16 at Marine Corps Air Ground Combat Center Twentynine Palms, California, June 19, 2016. Over the two-week period the Marines trained in combined-arms exercises to hone their skills as a Marine Air Ground Task Force, in order to prepare for worldwide deployment and augment the active component.

Lance Cpl. Grant R. Burch, a rifleman with Charlie Company, 1st Battalion, 24th Marine Regiment, simulates clearing a room during urban warfare training during Exercise Arctic Eagle at Camp Grayling, Michigan, April 24, 2014. Marines joined members of the Army National Guard and the Danish Home Guard at this exercise to train counterinsurgency tactics and urban warfare. - Lance Cpl. Grant R. Burch, a rifleman with Charlie Company, 1st Battalion, 24th Marine Regiment, simulates clearing a room during urban warfare training during Exercise Arctic Eagle at Camp Grayling, Michigan, April 24, 2014. Marines joined members of the Army National Guard and the Danish Home Guard at this exercise to train counterinsurgency tactics and urban warfare.