Shield
Argent, a cross patte double sarcelled at the foot Gules, surmounted by a castle tower of the field on a canton Azure a fess dovetail on the bottom of the first.
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
CLEAR, BUILD, DEFEND.
Shield
The battalion traces its lineage back to 1943 and the 291st Engineer Combat Battalion. The design symbolizes the successful mission of the unit during the Battle of the Bulge and World War II. The red and white stand for the Engineer branch of service. The tower of the Engineer castle is placed strategically at the intersection of five roads at Malmedy, Belgium (The Baugnez Crossroads). This represents the effort of 291st to fortify the FIVE POINTS, a strategic crossroads, and successfully contain and delay the German advance in the Ardennes Forest Offensive during the period of 17-26 December 1944. Subsequently, the 291st was the first unit to cross the Rhine River into Germany and were awarded the Presidential Unit Citation symbolized by the blue canton bearing a fess dovetailed on the bottom to evoke the heroic accomplishment of constructing a 1100 foot treadway pontoon bridge across the Rhine River at Remagen in 32 hours, longest ever, under fire from the enemy, and the first allied unit to cross the Rhine River into Germany in March of 1945.
Crest
The crest is that of the United States Army Reserve.
The coat of arms was approved on 2 March 2016.