Shield
Sable an anchor debruised by two oars saltirewise between in fess two increscents all Argent; on a chief of the last a pale wavy Gules bearing a seven pointed mullet Or.
Crest
On a wreath of the colors Argent (White) and Sable within a garland of oak fructed Argent (Silver Gray) a dexter arm embowed Proper grasping an arrow fesswise of the first (Silver Gray).
Motto
CLAIRS CHNES N'OUBLIEZ JAMAIS (The Cleared Oaks - Never Forget Them).
Shield
The two crescents are from the coat of arms of General Scott, who served in the Civil War. Black was the color of the facings of the Engineers in the Civil War. The anchor and oars represent the badge of the Engineer and Pontonier Corps of the Army of the Potomac. The wavy red pale on the upper part of the shield recalls the Marne, which the Regiment bridged, and the seven-pointed star from the cap badge of the Australians recalls their cooperation on the Amiens front.
Crest
The crest is a silver oak wreath to represent the capture of Claris Chnes (The White Oaks) Woods on 20 October 1918. The arm is from the family crest of Captain C.D. Harris, a hero of that action.
The coat of arms was originally approved for the 6th Engineer Regiment on 6 October 1921. It was amended to change the translation of the motto on 16 November 1921. It was redesignated for the 6th Engineer Battalion and amended to correct the history on 1 April 1940. It was redesignated for the 6th Engineer Combat Battalion on 18 September 1953. The insignia was redesignated for the 6th Engineer Battalion on 26 September 1958. It was rescinded on 16 November 1967. The insignia was reinstated for the 6th Engineer Battalion with the symbolism revised on 10 June 1987.