Officials have not identified the division that will deploy — the first division headquarters to go to Iraq since the U.S. withdrawal in 2011.

An official announcement is expected in the coming days. But Army Chief of Staff Gen. Ray Odierno recently confirmed the Army “will send another division headquarters to Iraq to control what we’re doing there, a small headquarters.”

It’s unclear how many soldiers will be sent, or how long they will deploy. Division headquarters average between 100 and 500 soldiers and deploy for one year.