A tactical controller with Tactical Training Exercise Control Group observes as Marines with 1st Battalion, 7th Marine Regiment, fire at a target at Range 400 at Marine Corps Air Ground Combat Center, Twentynine Palms, California, during 1/7’s night-time combined arms live-fire exercise Nov. 16, 2016. - A tactical controller with Tactical Training Exercise Control Group observes as Marines with 1st Battalion, 7th Marine Regiment, fire at a target at Range 400 at Marine Corps Air Ground Combat Center, Twentynine Palms, California, during 1/7’s night-time combined arms live-fire exercise Nov. 16, 2016.

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.

A Marine conceals himself under the obstruction of deployed smoke during the company supported, live-fire assault portion of a Marine Corps Combat Readiness Evaluation at Marine Corps Air Ground Combat Center Twentynine Palms, California, Dec. 6, 2015. The purpose of a MCCRE is to evaluate Marines’ collective performance in specific mission requirements that will prepare them for their upcoming deployment rotation. The Marine is with 2nd Battalion, 7th Marine Regiment, 1st Marine Division. - A Marine conceals himself under the obstruction of deployed smoke during the company supported, live-fire assault portion of a Marine Corps Combat Readiness Evaluation at Marine Corps Air Ground Combat Center Twentynine Palms, California, Dec. 6, 2015. The purpose of a MCCRE is to evaluate Marines’ collective performance in specific mission requirements that will prepare them for their upcoming deployment rotation. The Marine is with 2nd Battalion, 7th Marine Regiment, 1st Marine Division.

U.S. Marines with 1st Reconnaisance Battalion board a HUMVEE during Steel Knight 16 at Marine Corps Air Ground Combat Center Twentynine Palms, California, Dec. 11, 2015. Steel Knight is an annual field training exercise that enables 1st Marine Division to test and refine its command and control capabilities by acting as the headquarters element for a forward-deployed Marine Expeditionary Force. - U.S. Marines with 1st Reconnaisance Battalion board a HUMVEE during Steel Knight 16 at Marine Corps Air Ground Combat Center Twentynine Palms, California, Dec. 11, 2015. Steel Knight is an annual field training exercise that enables 1st Marine Division to test and refine its command and control capabilities by acting as the headquarters element for a forward-deployed Marine Expeditionary Force.

A Marine escorts an ambulatory HMMWV to a Shock Trauma Platoon during Exercise Steel Night’s mass casualty drill at Marine Corps Air Ground Combat Center Twentynine Palms, Calif., Dec. 12, 2015. The drill tested the 1st Marine Division’s ability to react to a large influx of injuries and wounds from battling the enemy. Steel Knight provides tough, realistic training for the Marines and sailors of 1st Marine Division. - A Marine escorts an ambulatory HMMWV to a Shock Trauma Platoon during Exercise Steel Night’s mass casualty drill at Marine Corps Air Ground Combat Center Twentynine Palms, Calif., Dec. 12, 2015. The drill tested the 1st Marine Division’s ability to react to a large influx of injuries and wounds from battling the enemy. Steel Knight provides tough, realistic training for the Marines and sailors of 1st Marine Division.

Marines perform a weapons functional test on an F-35B Lightning II aircraft during Exercise Steel Knight at Marine Corps Air Ground Combat Center Twentynine Palms, California, Dec. 10, 2015. The F-35B is a single seat, single engine stealth multi-role fighter bringing the Marine Corps into a whole new generation of aircraft. Exercise Steel Knight allowed for Marine Fighter Attack Squadron 121 and Marine Operational and Test Evaluation Squadron 22 to train on integrating the F-35B and find its place in the Marine Air Ground Task Force, while giving the ground forces of 1st Marine Division the ability to become familiar with it. - Marines perform a weapons functional test on an F-35B Lightning II aircraft during Exercise Steel Knight at Marine Corps Air Ground Combat Center Twentynine Palms, California, Dec. 10, 2015. The F-35B is a single seat, single engine stealth multi-role fighter bringing the Marine Corps into a whole new generation of aircraft. Exercise Steel Knight allowed for Marine Fighter Attack Squadron 121 and Marine Operational and Test Evaluation Squadron 22 to train on integrating the F-35B and find its place in the Marine Air Ground Task Force, while giving the ground forces of 1st Marine Division the ability to become familiar with it.

A Marine holds security during a route clearance drill as a part of Exercise Steel Knight at Marine Corps Air Ground Combat Center Twentynine Palms, California, Dec. 13, 2015. The Marine is with 1st Combat Engineer Battalion. During route clearance Marines use a variety of vehicles to search for improvised explosive devices, mines and other dangerous obstructions. Steel Knight is a 1st Marine Division led exercise, which enables the Marines and sailors to operate in a realistic environment to develop skill sets necessary to maintain a fully capable Marine Air Ground Task Force. - A Marine holds security during a route clearance drill as a part of Exercise Steel Knight at Marine Corps Air Ground Combat Center Twentynine Palms, California, Dec. 13, 2015. The Marine is with 1st Combat Engineer Battalion. During route clearance Marines use a variety of vehicles to search for improvised explosive devices, mines and other dangerous obstructions. Steel Knight is a 1st Marine Division led exercise, which enables the Marines and sailors to operate in a realistic environment to develop skill sets necessary to maintain a fully capable Marine Air Ground Task Force.

Staff Sgt. Joshua K. Crabtree, explosive ordnance disposal technician, 3rd EOD, 9th Engineer Support Battalion, performs a sweep with a metal detector during a post-blast analysis training scenario at Emerson Lake training area, Sept. 19, 2015. While aboard the Combat Center, EOD technicians received experience in working with a wider variety of ordnance than is usually available to the unit. - Staff Sgt. Joshua K. Crabtree, explosive ordnance disposal technician, 3rd EOD, 9th Engineer Support Battalion, performs a sweep with a metal detector during a post-blast analysis training scenario at Emerson Lake training area, Sept. 19, 2015. While aboard the Combat Center, EOD technicians received experience in working with a wider variety of ordnance than is usually available to the unit.

Marines with Company A, 1st Tank Battalion, 1st Marine Division, conduct a convoy to a staging area in preparation for the Tank Mechanized Assault Course during Integrated Training Exercise 1-15 aboard Marine Corps Air Ground Combat Center Twentynine Palms, Calif., Nov. 2, 2014. Company A Marines worked with infantry, mortars and air support during their assault. - Marines with Company A, 1st Tank Battalion, 1st Marine Division, conduct a convoy to a staging area in preparation for the Tank Mechanized Assault Course during Integrated Training Exercise 1-15 aboard Marine Corps Air Ground Combat Center Twentynine Palms, Calif., Nov. 2, 2014. Company A Marines worked with infantry, mortars and air support during their assault.