It was a Regular Army unit composed primarily of Filipino enlisted men and US officers.

During the Philippines Campaign of 1941/1942 this unit operated a wide variety of equipment and manned the following batteries.

Constituted 1924 as 91st CA (HD) Regt (PS) and organized 1 July 1924 at Fort Mills.

A Gold color metal and enamel device 1 1/4 (3.18 cm) in height on and within an annulet Gules bearing on lower part the motto “VERUS ET FIDELIS SEMPER” Or a shield of the first charged with a griffin sejant, wings elevated and addorsed, of the second.

The motto translates to “Always True and Faithful.” The distinctive unit insignia was approved on 3 April 1928.