By SARAH CAMMARATA | STARS AND STRIPES Published: May 3, 2021 WASHINGTON — A Marine Corps major general has been suspended from his duties after an investigation into the deadly sinking last year of an amphibious assault vehicle determined he was in part responsible for the accident, a service official said Monday at a House hearing. Gen. Gary Thomas, the assistant commandant of the Marine Corps, told members of a subpanel of the House Armed Services Committee that Maj. Gen. Robert Castellvi, who oversaw the ground combat unit that was involved in the training when the accident happened, had been placed on administrative leave last week from his duties as the service inspector general.