Shield: Azure, an oak tree Or; on a chief dancette Gules fimbriated Argent three alerions of the second.
Crest: That for the regiments and separate battalions of the Army Reserve: On a wreath of the colors Or and Azure the Lexington Minute Man Proper. The statue of the Minute Man, Captain John Parker (H.H. Kitson, sculptor), stands on the Common in Lexington, Massachusetts.
Motto: JAMAIS TROP TARD (Never Too Late).
Symbolism
Shield: The shield is blue for Infantry and blue is also the color of the shield of the coat of arms of St. Mihiel. The dancette participation line alludes to the three rocks on the coat of arms of St. Mihiel. The oak tree represents service in the Meuse-Argonne. The arms of Lorraine are "Or, on a bend Gules three alerions of the field," and the three alerions on the red chief denote service in Lorraine.
Crest: The crest is that of the United States Army Reserve.
Background
The coat of arms was originally approved for the 311th Infantry Regiment on 12 March 1929. It was redesignated for the 311th Regiment on 8 July 1960.