ShieldPer fess Gules and Or, a mullet counterchanged of the field within a bordure similarly divided of the second and Vert.
CrestThat for the regiments and separate battalions of the Army Reserve: On a wreath of the colors Or and Gules, 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.
MottoWE ALSO SERVE.
ShieldThe colors of the shield indicate the history of the Regiment as Cavalry, Artillery and again Cavalry. The Lone Star suggests the State in which the 313th was organized and the green and yellow border the service along the southwestern border.
CrestThe crest is that of the United States Army Reserve.
The coat of arms was approved on 12 October 1925. It was amended to correct the blazon of the shield on 8 April 1927. The insignia was rescinded on 2 February 1959.