Original US Army 11th Infantry Brigade (11 IN BDE) patch. Subdued black on OD embroiderey. The 11th Infantry Brigade is best known for its service with the 23rd Infantry Division from 1967 through 1971 in the Vietnam War as a light infantry brigade. The brigade is known for its responsibility in the My Lai Massacre. Genuine US Army surplus, Made in the USA, in New, Unissued condition.