American Expeditionary Force, Russia World War II Rome-Arno, North Apennines, Po Valley Gulf War Defense of Saudi Arabia, Liberation and Defense of Kuwait The 170th Infantry Brigade was an infantry formation of the United States Army.

The 340th Infantry Regiment and the remainder of the Brigade was stationed in Lorraine, on the Western Front in France where the 85th served as a depot division and did not participate in any combat operations.

Per the National Defense Act of 1920, the brigade was reconstituted in the Organized Reserve on 24 June 1921, assigned to the 85th Division, and allotted to the Sixth Corps Area.

The soldiers and equipment will remain in place but the 2d Brigade flag will transfer to Ft. Bliss, Texas, joining other elements of the 1st Armored Division.

In early 2011, the 170th IBCT deployed in support of Operation Enduring Freedom 11–12 to Regional Command North.

The 3d Battalion, 4th Infantry Regiment deployed in November 2010 to Regional Command Capital where it initially assumed part of the NTMA training mission in and around Kabul.

The brigade's 4th Battalion, 70th Armor Regiment deployed to Regional Command South where it operated under Combined Team Uruzgan, partnered with the Australian Army.