Shield
Sable, an anchor debruised by two oars saltirewise between in fess two increscents all Argent; on a chief of the last embattled a cross Gules.
Crest
On a wreath of the colors Argent and Sable a fusil Gules on a bridge bent Argent.
Motto
SEVEN TIMES TESTED BY FIRE.
Shield
Black and white were the old colors of the Engineer Corps. The anchor and oars device was the badge of the Engineers and Pontoniers of the Army of the Potomac where the old units of the regiment did such gallant service. The crescents are the device of General Winfield Scott and represent the service of the old company in 1846-1848 in the Mexican War. In France, the regiment served with great gallantry in the 5th Division. The crossing of the Meuse near Dun is indicated by the device in chief of the shield which is not only a cross for the crossing of the river but the device of the lords of Dun.
Crest
The crest well symbolizes the work of the regiment in the 5th Division. In the very rough work of November 2 to 6, 1918, the regiment was called upon to prove itself seven distinct times. The motto is a recollection of this.
The coat of arms was originally approved for the 7th Engineer Regiment on 8 April 1922. It was redesignated for the 7th Engineer Battalion and amended to update the history on 7 March 1940. It was redesignated for the 7th Engineer Combat Battalion on 13 May 1953. The insignia was redesignated for the 7th Engineer Battalion on 6 July 1954.