Authorised 17 August 1925
The coat of arms was originally approved for the 11th Engineer Regiment on 19 August 1924. It was amended to revise the blazon of the shield on 18 February 1937. It was redesignated for the 11th Engineer Combat Battalion on 14 December 1943. It was redesignated for the 11th Engineer Battalion (Combat) on 1 July 1955. The coat of arms was amended to revise the symbolism on 17 November 1972.
A Silver color metal and enamel device 1 1/8 inches (2.86 cm) in height overall, on a wreath Argent and Gules, a Black panther's head erased Proper langued Gules. The insignia is worn in pairs. The crest commemorates the long service of the 11th Engineers in the Panama Canal Zone. The distinctive unit insignia was originally approved for the 11th Engineer Regiment on 17 August 1925. It was amended to correct the description on 21 August 1925. It was redesignated for the 11th Engineer Combat Battalion on 12 January 1951. It was redesignated for the 11th Engineer Battalion (Combat) on 1 July 1955.