Shield
Gules, a fess between the Alamo affront and a fleur-de-lis Argent.
Crest
That for the regiments and separate battalions of the Army Reserve: From a wreath Argent 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.
Motto
That for the regiments and separate battalions of the Army Reserve: From a wreath Argent 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.
Shield
Scarlet and white are the colors for the Corps of Engineers. The shield is accordingly made scarlet with charges white. The Alamo indicates the birthplace of the unit as Texas, and the fleur-de-lis symbolizes service in France.
Crest
The crest is that of the U.S. Army Reserve.
The coat of arms was originally approved for the 315th Engineer Regiment on 3 August 1925. It was redesignated for the 315th Engineer Battalion on 8 April 1942. It was redesignated for the 315th Engineer Battalion (Combat) on 9 January 1956. The insignia was authorized for the 315th Engineer Battalion and amended to update the authorization on 31 October 2008.