ShieldPer bend Gules and Azure, issuant from sinister a dexter arm in armor fesswise, holding in gauntlet Or, an assortment of tank parts Argent.
CrestThat for the regiments and separate battalions of the Washington Army National Guard: On a wreath of the colors Or and Gules a raven with wings endorsed issuing out of a ducal coronet all Proper.
MottoFIRE AND MOVEMENT.
ShieldRed, blue and yellow are the colors historically associated with Armor and the Armored Force of World War II. The mailed arm holding the tank parts is representative of the force and effectiveness of Armor.
CrestThe crest is that of the Washington Army National Guard.
The coat of arms was originally approved for the 803d Tank Destroyer Battalion on 2 December 1942. It was redesignated for the 803d Tank Battalion on 22 September 1947. It was amended to add the Washington National Guard crest on 13 October 1948. It was redesignated for the 303d Armor Regiment on 27 March 1961. The insignia was amended to change the symbolism on 30 September 1969. It was redesignated for the 303d Cavalry Regiment effective 1 September 2005. It redesignation for the 303d Cavalry Regiment was rescinded and the insignia was reauthorized for the 303d Armor Regiment effective 1 September 2005.