Capital  Military Assistance Command

The shoulder sleeve insignia was authorized on 29 July 1969 and is described as follows:


On a hexagon 2-1/4 inches overall in width and 3 inches overall in height, the vertical sides 1-13/16 inches in length, divided saltirewise into two unequal ultramarine blue areas and two equal scarlet areas, the saltire divisions lines issuing from the two lower corresponding angles of the hexagon and intersecting 7/8 inch from the upper angle, a vertical unsheathed Crusader's sword, point up, with white blade and yellow hilt, between in base two white five-pointed stars (of a size inscribed in a circle 5/8 inch in diameter) one point up, the vertical axis of each star coinciding with the saltire division lines and the center of each star 13/16 inch from the two lower corresponding angles all within a 1/8 inch white border.


The Crusader's sword point up, with white blade and yellow hilt appears on both the shoulder sleeve insignia of the United States Army Vietnam (on an ultramarine blue base) and of the United States Military Assistance Command Vietnam (on a scarlet base). The sword, a symbol of strength and courage, refers in this instance to the Capital Military Assistance Command and with the ultramarine blue and scarlet base provides a link with USARV and USMACV as the superior headquarters. The white five-pointed star is a United States symbol and is also similar to that of the Army of the Republic of Vietnam; the two stars placed on either side of the guard of the unsheathed sword refer to the constant and combined effort of the United States and the Army of the Republic of Vietnam in protecting Saigon, the capital of South Vietnam. The scarlet color also represents the Artillery which provides surveillance and counter measures against enemy rockets and mortar attacks, the blue color referring to the Infantry which continually patrols in and near Saigon to prevent enemy infiltration and ground attack.

Source: The Institute of Heraldry

Capital  Military Assistance Command - Signal Section

The collar insignia was a creation of the CMAC Signal Section and although worn was never authorised. 


Crossed semaphore flags, the symbol of the Signal Corps overlaid with a 122mm Rocket symbolising the Defence of Saigon.