US military bases are fortresses that guard against external threats. But what happens when the threat comes from within?

Federal agencies US military See all topics Facebook Tweet Email Link Link Copied! Follow

Fort Stewart in Georgia houses the US Army’s vaunted 3rd Infantry Division, a premier fighting force roughly 20,000 soldiers strong.

It was at the headquarters of the division’s 2nd Armored Brigade Combat Team, described by the Army as its “most lethal and fit” armored brigade combat unit — formidably equipped with tanks and modern artillery systems — where five soldiers were wounded Wednesday when authorities said a 28-year-old active-duty sergeant pulled out a personal weapon and opened fire.

The latest shooting at a US military fortress long accustomed to guarding against external threats demonstrates that no amount of physical security can totally protect soldie