The 1st Infantry Division headquarters will deploy to Iraq in the coming weeks as the U.S. expands its war against the Islamic State, officials announced Thursday.

The Big Red One, of Fort Riley, Kansas, will be the first division headquarters to go to Iraq since the U.S. withdrawal in 2011.

About 500 soldiers will deploy in late October to the Central Command area of operations, Pentagon Press Secretary Rear Adm. John Kirby said Thursday in a briefing with reporters. […]