Shield
Per fess enhanced dovetailed of three Argent and Gules, in base a fleur-de-lis flowered of the first.
Crest
From a wreath Argent and Gules, a mountain range Purpure superimposed by a dragon passent Or, garnished Gules, Buff, Brown, Goldenlight and breathing flames Proper, grasping a divider points to base Gules.
Motto
MIND AND HAND.
Shield
Scarlet and white are the colors of the Corps of Engineers. The fleur-de-lis flowered was suggested by the coat of arms of Florence, Italy, where the battalion was activated after being reconstituted in 1944. The dovetail is used to allude to an engineering construction principle. The three points represent the organization's three battle honors awarded for service in Italy during World War II.
Crest
The many campaigns in which the 169th participated, during the Vietnam conflict are recalled by the golden dragon, holding an engineer's divider to symbolize the outstanding construction work the unit accomplished in support of military operations during 1967 and 1968. The mountains represent the rugged country in which exacting land development projects were completed and also symbolize the regions in Italy where the unit saw action during World War II, specifically the Po Valley, North Apennines and Rome-Arno. Scarlet denotes courage and recalls three Meritorious Unit Commendations and the Republic of Vietnam Civil Action Honor Medal awarded the 169th in the period 1966 to 1970.
The coat of arms was originally approved on 26 Jan 1956. It was amended on 12 Jan 1999 to add the crest.