A Gold color metal and enamel device 1 1/8 inches (2.86 cm) in height overall consisting of a shield blazoned: Per bend Azure and Gules, in chief a lozenge Argent and in base a falcon close Proper upon a mount Or, on a canton of the second fimbriated Gold, a dexter arm embowed Proper grasping a broad sword Or; all within a bordure of the last. Attached below the shield a Gold scroll inscribed "POSSET" in Black letters.
The shield is the coat of arms approved for the 241st Coast Artillery Regiment within a border, indicating descent from that organization. The shield is blue and red indicating the service of the parent organization as both Infantry and Artillery. In the canton is the device of the old Roxbury Artillery. The white diamond is the badge of the 3rd Corps of the Army of the Potomac in the Civil War, and the falcon on the hill represents Mount Falcon in World War I.
The distinctive unit insignia was originally approved for the 772d Antiaircraft Artillery Gun Battalion, Massachusetts National Guard on 30 November 1951. It was rescinded on 15 August 1961. It was reinstated and redesignated for the 164th Transportation Battalion on 18 December 1967. The insignia was redesignated for the 1058th Transportation Company with the description and symbolism revised on 28 January 1991. It was redesignated for the 164th Transportation Battalion on 13 November 2006.