The 3rd Brigade is a part of the 4th Infantry Division of the Regular Army ¹. It was constituted on November 19, 1917, as Headquarters, 8th Infantry Brigade, and was organized in December 1917 at Camp Greene, N.C. ¹. The Brigade has been reorganized and redesignated several times over the years ¹. The 3rd Brigade of the division was inactivated at Fort Lewis after pulling out of Vietnam first in INCREMENT III of the U.S. Army withdrawal ². It later joined the 4th Infantry Division from the 25th Infantry Division when the division was sent back to the U.S. in INCREMENT V to Fort Carson, Colorado ².