Per bend Argent and Gules.
On a wreath of the colors Argent and Gules an oak leaf bendwise Gules in front of a rock Proper.
The shield is divided per bend, red and white, the colors of the Corps of Engineers.
The crest consists of a rock taken from the coat of arms of St. Mihiel, while the oak leaf represents service at Meuse-Argonne during World War I.
The coat of arms was originally approved for the 15th Engineer Battalion (Separate) on 27 February 1941. It was redesignated for the 15th Engineer Battalion (Combat) on 7 July 1954.