The 24th Field Artillery Regiment (Philippine Scouts) was constituted as a Regular Army unit on 22 December 1920, part of the Philippine Department. It was organized at Fort Stotsenburg on 15 May 1921 from the 1st Philippine Field Artillery Regiment (Provisional) (Mountain) and the 11th and 12th Infantry Battalions (Philippine Scouts) with the Philippine Division. Initially equipped with the 2.95-inch Mountain Gun, it converted to the truck-drawn 75 mm M1917 guns on 2 September 1931. During 1924 and 1925 it helped build a bridge over the Pinatubo River, and in the 1920s and 1930s also participated in the construction of an artillery trail from Fort Stotsenburg to the South China Sea via the Zambales Pass.