Shield
Gules, a lion rampant Argent; on a canton gray fimbriated Or over a saltire Azure fringed of the fourth a sheathed Roman sword paleways, point to base, of the last.
Crest
That for the regiments and separate battalions of the New York Army National Guard: On a wreath of the colors Argent and Gules, the full rigged ship Half Moon all Proper.
Motto
DEFENDAM (May I Defend).
Shield
The shield is red and the charge white, the Engineer corps colors. The lion rampant indicating the service of the Regiment as Engineers in Flanders, Belgium and Picardy during World War I. The gray canton charged with the saltire and the sheathed Roman sword depict the service of the organizations from which the 102d Engineers was descended. The gray canton represents the Union Grays; the blue saltire denotes the service of the 22d Infantry, New York National Guard in the Northern Army during the Civil War; and the sheathed Roman sword, taken from the Spanish War service medal, symbolizes the service of the 22d Infantry, New York Volunteers within the continental limits of the United States during the Spanish-American War.
Crest
The crest is that of the New York Army National Guard.
The coat of arms was originally approved for the 102d Engineer Regiment on 6 April 1929. It was redesignated for the 102d Engineer Battalion on 27 October 1943. It was redesignated for the 102d Engineer Combat Battalion on 8 February 1954. The insignia was redesignated for the 102d Engineer Battalion on 22 June 1967.