Shield
Gules, on a chevronel Argent four mullets Azure, in chief a lion's face and an imperial Chinese dragon affront both Or, langued of the third, in base a golden fleur-de-lis.
Crest
On a wreath of colors Argent and Gules a demi-sun Or charged with an Aztec banner Vert garnished Argent.
Motto
CELERITAS ET ACCURATIO (Speed and Accuracy).
Shield
The shield is scarlet for Artillery. The Civil War is represented by the chevron and four stars, one for each battery in that war. The lion's face, dragon and fleur-de-lis allude to the War of 1812, China Relief Expedition and World War I, respectively.
Crest
The rising sun indicates the regiment dates back nearly to the dawn of this country's history (Battery "D" was organized in 1802), and the Aztec banner is for the Mexican War.
The coat of arms was originally approved for the 3d Field Artillery on 16 April 1921. It was amended to change the description and symbolism on 7 July 1921. It was redesignated for the 3d Field Artillery Battalion on 25 March 1941. It was redesignated for the 3d Armored Field Artillery Battalion on 7 December 1943. It was cancelled on 19 October 1959. The coat of arms was restored and authorized for the 3d Field Artillery Regiment effective 1 September 1971. The coat of arms was amended to correct the description of the shield on 30 October 2001.