Fort Stewart, Georgia (CNN) — US Army 1st Sgt. Joshua Arnold was in a conference room with one of his officers at Fort Stewart military base in Georgia on Wednesday when the crack of gunfire pierced the air.

“That sounds like a gunshot. That sounds like a gunshot,” he said.

As he stood, “it seemed like a flash went past my conference room,” he told CNN. He stepped into the hallway and called out, “Was that a gunshot?”

No one answered.

Arnold ran down the hall, past a spent shell casing lying on the ground. Then, he saw a person – one of five soldiers who were wounded when authorities say a 28-year-old active-duty sergeant pulled out a personal weapon and opened fire.

Staff Sgt. Melissa Taylor was checking her email in her office nearby, the day so far unfolding as a regular duty day

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