Infantry Marines move to counter-attack the enemy’s attack in the later stage of the battalion assault course Feb. 10 at Marine Air Ground Combat Center Twentynine Palms, California, during Integrated Training Exercise 2-15. Infantry Marines use amphibious assault vehicles to move across the battle space faster and safer than on foot. The infantry Marines are with 1st Battalion, 4th Marine Regiment, 1st Marine Division, I Marine Expeditionary Force. The AAV operators are with Company D, 3rd Amphibious Assault Battalion, 1st Marine Division, I Marine Expeditionary Force. - Infantry Marines move to counter-attack the enemy’s attack in the later stage of the battalion assault course Feb. 10 at Marine Air Ground Combat Center Twentynine Palms, California, during Integrated Training Exercise 2-15. Infantry Marines use amphibious assault vehicles to move across the battle space faster and safer than on foot. The infantry Marines are with 1st Battalion, 4th Marine Regiment, 1st Marine Division, I Marine Expeditionary Force. The AAV operators are with Company D, 3rd Amphibious Assault Battalion, 1st Marine Division, I Marine Expeditionary Force.