ShieldAzure (Korean service ribbon Blue), a triple mount Buff fimbriated Or and in base a Korean gateway of the last.
CrestThat for the regiments and separate battalions of the California Army National Guard: On a wreath of the colors Or and Azure (Korean service ribbon Blue), the setting sun behind a grizzly bear passant on a grassy field all Proper.
MottoSEMPER UBIQUE SERVIENS (Always and Everywhere Serving).
ShieldBuff is the color of the Quartermaster Corps and represents the original service of the organization. The triple mount and the Korean service ribbon blue symbolize combat service in Korea. The golden Korean gateway alludes to the Korean Presidential Unit Citation awarded the organization.
CrestThe crest is that of the California Army National Guard.
The coat of arms was originally approved for the 40th Armored Quartermaster Battalion on 8 February 1956. It was redesignated for the 40th Quartermaster Battalion on 23 March 1961. It was redesignated for the 540th Support Battalion and amended to correct the spelling of the motto on 5 July 1968. The insignia was redesignated for the 540th Maintenance Battalion on 24 April 1975. It was redesignated for the 540th Support Battalion on 18 May 1987.