A crew chief with Marine Medium Tiltrotor Squadron (VMM) 364 watches as an MV-22B Osprey follows behind their aircraft during exercise Seahorse Wind on Dec. 6. Exercise Seahorse Wind was a long-range raid exercise conducted by over 600 Marines with the 3rd Marine Aircraft Wing and the 1st Marine Division. - A crew chief with Marine Medium Tiltrotor Squadron (VMM) 364 watches as an MV-22B Osprey follows behind their aircraft during exercise Seahorse Wind on Dec. 6. Exercise Seahorse Wind was a long-range raid exercise conducted by over 600 Marines with the 3rd Marine Aircraft Wing and the 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. - 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.