A spokesman for 2nd Marine Division based at Camp Lejeune said that a battalion commander, a company commander and a weapons officer had been relieved, according to the report.
On March 18, a 60-millimeter round exploded in a mortar tube during the training exercise at the Hawthorne Army Depot, about 140 miles southeast of Reno.
Lance Cpl. Mason Vanderwork, 21, Cpl. Aaron Ripperda, 26, Lance Cpl. Josh Taylor, 21, Lance Cpl. Roger Muchnick, 23, Pfc. Josh Martino, 19, Lance Cpl. William Taylor Wild IV, 21, and Lance Cpl. David Fenn II, 20, died in the accident. Eight other servicemen were injured.
The incident led to the Marines suspending the use of all 60-millimeter mortar rounds and similar ammunition until a full investigation is complete.