ShieldGules, a pale Argent charged with a palm tree Proper, in dexter fess a tower triple towered and in sinister a fleur-de-lis encircled by a garland of laurel all Or.
CrestThat for the regiments and separate battalions of the California Army National Guard: On a wreath of the colors Argent and Gules, the setting sun behind a grizzly bear passant on a grassy field all Proper.
MottoOram Occidentalem Defendimus (We Defend The Western Coast).
ShieldThe shield is red for Artillery. The Spanish castle is for the Philippine service in the Spanish War, the palm tree is for service in the Philippine Insurrection and the wreathed fleur-de-lis is for World War I.
CrestThe crest is that of the California Army National Guard.
The coat of arms was originally approved for the 250th Coast Artillery Regiment on 24 March 1925. It was redesignated for the 728th Antiaircraft Artillery Gun Battalion on 9 January 1952. The insignia was redesignated for the 250th Artillery Regiment on 17 March 1961. It was redesignated for the 250th Air Defense Artillery Regiment on 6 July 1972.