Authorised 17 June 1942
A Silver color metal and enamel device 1 1/4 inches (3.18 cm) in height overall consisting of a shield blazoned: Gules, a fesse wavy enhanced Azure, another Argent (Silver Gray) charged with five mullets Sable, in base a sea horse naiant of the third; on a chief wavy Argent, a pale Gules between two mullets Or, bearing a palm frond Proper. Attached above the shield a Black scroll inscribed "PUT EM ACROSS" in Silver letters.
The design was based on the design of the British Combined Operations patch which was worn by commandos, landing craft personnel, and others.
The shoulder sleeve insignia was originally approved for the Engineer Amphibian Units on 17 June 1942. It was redesignated for all Army personnel assigned to the following amphibian units: Amphibian Tank Battalions; Amphibian Tractor Battalions; Engineer Amphibian Units; Joint Assault Signal Companies; Headquarters Ships Detachments (Type A); Headquarters Ships Detachment (Type B); Headquarters Section (Army); and Amphibian Training Command - Pacific Fleet on 10 June 1944. The insignia was redesignated for the 1st Engineer Brigade and amended to update the description and add a symbolism on 20 July 2007. (TIOH Dwg. No. A-1-263) Distinctive Unit Insignia