Description
On a Blue shield shape device 3 inches (7.32 cm) in height and 2 1/2 inches (6.35 cm) in width overall, issuing from a Yellow rising sunburst Or fimbriated Scarlet a Spanish castle of the like, in dexter chief four White mullets all slightly tipped to dexter arranged to represent the Southern Cross; all within a 1/8 inch (.32 cm) White border.

Symbolism
The service of the former organization, the 164th Infantry Regiment is indicated by the blue shield for Infantry and with the Spanish castle taken from the Spanish Campaign medal represents the Spanish American War and Philippine Insurrection service. The sun in base from the 41st Division’s shoulder sleeve insignia, denotes World War I service with that Division. The stars of the Southern Cross come from the Americal Division’s shoulder sleeve insignia, and denote World War II service with that Division.

Background
The shoulder sleeve insignia was approved effective 1 September 2008. (TIOH Drawing Number A-1-972)