Shield
Gules, a fleur-de-lis Or; on a chief Argent a saltire Azure.
Crest
That for the regiments and separate battalions of the Connecticut Army National Guard: On a wreath of the colors Or and Gules, a grape vine supported and fructed Proper.
Motto
DEVOIR (Duty).
Shield
The shield is scarlet and white, the colors used for the Corps of Engineers, the gold fleur-de-lis on the scarlet filed representing service as Artillery in France during World War I. The saltire simulates a brace or support used in engineering construction and is blue in color in reference to those elements of the Battalion which were originally Infantry.
Crest
The crest is that of the Connecticut Army National Guard.
The coat of arms was originally approved for the 242d Coast Artillery Regiment on 16 February 1928. It was redesignated for the 242d Coast Artillery Battalion on 14 February 1945. It was redesignated for the 283d Antiaircraft Artillery Gun Battalion and amended to delete a charge (lion) due to the reorganization of Connecticut National Guard units and change in historical facts on 31 March 1952. It was redesignated for the 283d Antiaircraft Artillery Battalion on 29 September 1958. The insignia was redesignated for the 242d Engineer Battalion and amended to change the symbolism on 22 January 1970.