Shield
Argent, on a pile Gules a sun rayonnant with eight groups of rays Or.
Crest
On a wreath of the colors Argent and Gules, a spade iron Or in front of a caltrap of the first surmounting a taeguk.
Motto
FAIT ACCOMPLI (It Is Accomplished).
Shield
The shield is red (gules) and white (argent) for Engineers. The pile represents the character of the organization as an Engineer unit. The golden sun, taken from the Philippine flag, is symbolic of the organizations World War II service.
Crest
Scarlet and white are the colors used for Engineers. The taeguk refers to Korea and together with the spade iron, a strengthening appendage to a spade, and the caltrap, a device used to impede enemy troops, symbolize the Battalions Korean service. The spade iron further simulates the Roman numeral V and refers to the five decorations awarded for that service. The colors blue, white and red are indicative of the Philippine Presidential Unit Citation awarded for their Philippine service at an earlier period.
The coat of arms was originally approved for the 79th Engineer Construction Battalion on 15 September 1950. It was redesignated for the 79th Engineer Battalion on 30 June 1955. The insignia was amended to add a crest on 27 April 1976.