ShieldPer pale Or and Gules, two chevronels counterchanged in dexter chief a horse's head erased with an annulet Sable.
CrestThat for the regiments and separate battalions of the Wisconsin Army National Guard: On a wreath of the colors Or and Gules, a badger couchant Proper.
ShieldYellow (Or) for the Cavalry service, is impaled with the scarlet for the Regiment's conversion into Field Artillery during World War I. The two chevronels represent the two chevrons of a year's overseas service. The ringed horse's head device is that of the Light Horse Squadron, organized in Milwaukee in 1880, in which the Regiment had its origin. The motto "Follow Me" is the keynote of modern Cavalry tactics.
CrestThe crest is that of the Wisconsin Army National Guard.
The coat of arms was originally approved for the 105th Cavalry Regiment (1st Wisconsin National Guard) on 30 January 1923. It was redesignated for the 126th Field Artillery Battalion on 19 May 1942. It was redesignated for the 126th Artillery Regiment on 30 December 1963. The insignia was redesignated for the 126th Field Artillery Regiment on 27 September 1972. It was redesignated effective 1 September 2008, for the 257th Support Battalion. It was amended to correct the crest symbolism on 28 March 2011.