ShieldAzure, a saltire Argent voided throughout Gules, in chief a fleur-de-lis Or, in base four mullets of the like, one, two and one; on a canton Argent a crescent Gules within a five bastioned fort of the like voided of the field.
CrestFrom a wreath Argent and Azure an engineer's transit couped at the head of the tripod, Proper.
MottoPRAEVALEMUS (We Succeed).
ShieldThe blue shield with the red saltire is from the arms of Langres, Haute Marne, France, and recalls the location of the headquarters of the 29th Engineers and the Base Printing Plant during World War I. The white piping along the red diagonals gives the Engineer colors. The four stars indicate the four major operations with the 29th Engineers are credited as follows: Aisne-Marne, Toul Sector, St. Mihiel, Meuse-Argonne. The red five bastioned fort indicates the number of the parent organization (5th Engineers), and also recalls the Santiago Campaign of 1898. The crescent symbolizes the fighting against the Philippine Moros.
CrestThe engineer's transit indicates the original topographic mission of the unit.
The coat of arms was originally approved for the 29th Engineer Battalion on 6 February 1924. It was amended to add a crest and motto on 14 March 1924. It was amended to correct the blazon of the shield on 7 October 1924. The insignia was redesignated for the 29th Engineer Topographic Battalion on 29 April 1943. It was cancelled on 4 April 1969. The coat of arms was reinstated for the 29th Engineer Battalion on 11 December 1996.