Now, more than three years after the U.S. military presence in Iraq was thought over, about a quarter of the Panther Brigade will return with a new mission to help train Iraqi forces to fight the Islamic State.
About 1,000 paratroopers from the brigade will deploy this week as part of the Operation Inherent Resolve mission.
The deployment was officially announced in December and is expected to last nine months.
As his paratroopers prepared for the mission, the brigade commander, Col. Curtis A. Buzzard, has watched tensions boil in the Middle East - and Iraq in particular - as forces have fought against the Islamic State group, also known by the acronym DAESH based on the group's Arabic name, ad-Dawlah al-Islamiyah fi al-Iraq wash-Sham.
"We've seen the impact of DAESH over the last year and a half, not just on Iraq, but on the region," Buzzard said. "It's clearly an existential threat.