Shield
Gules a bend cottised Or between in sinister chief a triangle voided point up Argent and in dexter base a fleur-de-lis of the second.
Crest
On a wreath of the colors Or and Gules, an osprey's head erased Proper.
Motto
AUDAX ET VIGILANS (Daring and Vigilant).
Shield
The shield is that of the old 56th Artillery, C.A.C., of which three batteries of the 11th Coast Artillery were a part, Headquarters A and C Batteries. The silver triangle was the insignia for the 56th Artillery in France. The fleur-delis was taken from the coat of arms of the old Province of Ile de France where the Regiment first went into action.
Crest
The crest is taken from the old Coast Defenses of Long Island Sound. The motto is applicable to a Coast Artillery Regiment and is quite symbolic of the fish hawk, which is a very daring and vigilant bird.
The coat of arms was originally approved for the 11th Coast Artillery Regiment on 1 November 1924. It was redesignated for the 11th Antiaircraft Artillery Automatic Weapons Battalion on 8 August 1951. The insignia was redesignated for the 11th Antiaircraft Artillery Missile Battalion on 31 August 1956.