Shield
Per fess Azure and Argent, in chief on a pale counterchanged a fleur-de-lis of the first.
Crest
That for the regiments and separate battalions of the Army Reserve: On a wreath of the colors 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.
Motto
INVICTUS (Unconquerable).
Shield
Blue is a color traditionally associated with Infantry, the original branch of the organization; white represents the color of the old Infantry facings. The three blue portions of the shield allude to the states of Louisiana, Mississippi and Alabama, the allocation of the 87th Division, of which the parent unit, the 345th Infantry of Alabama, formed a part. The three white portions of the shield symbolize the stations where the original unit received training during World War I. The fleur-de-lis indicates that the service was in France.
Crest
The crest is that of the United States Army Reserve.
The coat of arms was originally approved for the 345th Infantry Regiment on 24 July 1928. It was amended to withdraw "Organized Reserves" from the nomenclature and delete the crest on 20 July 1959. It was amended to reinstate the crest of the Army Reserve and revise the symbolism on 5 August 1970. The insignia was redesignated for the 345th Regiment with the symbolism revised on 5 April 1993.