Shield
Argent, the badge of the old 2d Infantry, New York National Guard, Proper (a Red apple with stem and two leaves, charged with a White figure "2"); on a chief Azure a Roman sword in sheath (from the Spanish War medal), a prickly pear cactus and a fleur-de-lis, all Or.
Crest
That for the regiments and separate battalions of the New York Army National Guard: From a wreath Argent and Azure, the full rigged ship "Half Moon" all Proper.
Motto
POSSUMUS ET VINCEMUS (We Are Able And Will Conquer).
Shield
The shield is white, the color of the old Infantry facings. The apple is the badge of the old 2d Infantry, New York National Guard, which organization was known as the "Appleknockers." The chief is blue, the present Infantry color. The sheathed sword represents service during the Spanish-American War; the cactus, service on the Mexican Border; and the fleur-de-lis, service during World War I.
Crest
The crest is that of the New York Army National Guard.
The coat of arms was originally approved for the 105th Infantry Regiment on 13 February 1928. It was redesignated for the 205th Tank Battalion on 6 July 1955. It was redesignated for the 105th Infantry Regiment on 26 March 1962. The insignia was redesignated effective 1 September 2005, for the 501st Ordnance Battalion.