What really happened at Fort Stewart?

On August 6th, Sergeant Joshua Arnold was in a conference room at Fort Stewart, Georgia, when he heard a loud blast. He ran down the hall and saw a metal casing on the floor—then, an injured soldier.
Elsewhere in the building, a fellow soldier — Quornelius Radford, one of Arnold’s coworkers — had triggered the emergency situation, leading to injuries among five service members.