ShieldTierced in pairle Azure, Or and Gules (Crimson) an arch counterchanged; in chief a mullet of eight of the second.
CrestThat for the regiments and separate battalions of the Army Reserve: From a wreath of the colors Or and Gules (Crimson), the Lexington Minute Man Proper. The statue of the Minute Man, Captain John Parker (H.H. Kitson, sculptor), stands on the common in Lexington, Massachusetts.
MottoSERVITIUM CUM COR (Service With Courage).
ShieldThe eight-pointed star composed of two four-pointed stars joined together alludes to the COSTAR origin of the unit. The triangle stands for the three main functions of the battalion: direct support maintenance, maintenance supply and evacuation support. The color blue is for faithful service. The golden arch denotes the Saint Louis area as the origin of most of the original personnel.
CrestThe crest is that of the United States Army Reserve.
The coat of arms was approved for the 620th Support Battalion effective 16 September 1995.