Per pale Azure (Dark Blue) and Gules, a plate surmounted with a billet per pale embattled Red and Azure, overall and issuant from the embattled partition line two demi-lions regaurdant and endorsed in pale Or, detailed of the field, and langued in counterchange.
That for the regiments and separate battalions of the Army Reserve: From a wreath Argent and Azure, 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.
The disc represents a turntable, a rotating platform used to shift weights toward different directions. It refers to the Battalion's function of processing replacements. The rectangular shape is a heraldic device known as a billet and alludes to the unit's billeting mission. The two lions issuing from the embattled partition line stand for the Battalion's participation in two campaigns in France in World War II; the lion is from the arms of Normandy. Also, the positions of the lions on the device refer to the arrival and departure of military replacements.
This coat of arms was approved for the 817th Replacement Battalion on 12 May 1998.