The deadly events of July 30, 2020, marked the end of a “chain of failure” that began seven months before, when an AAV platoon belonging to 3rd Amphibian Assault Battalion at Camp Pendleton, Calif., received inoperable amphibious vehicles just a few months before they’d join the 15th Marine Expeditionary Unit to train for an overseas deployment, according to the senior investigator.The battalion “did not properly train or equip this AAV Platoon for a very difficult MEU training cycle and deployment,” the investigator wrote. “They formed the platoon late, the platoon was not properly trained and evaluated to join the 15th...