It was originally constituted 2 February 1901 in the Regular Army as the 30th Infantry.

Constituted 1 July 1916 in the Regular Army as the 11th Field Artillery.

Constituted 1 July 1916 in the Regular Army as the 25th Cavalry.

The 2nd Infantry Division was first constituted on 21 September 1917 in the Regular Army.

It was constituted 9 July 1918 in the Regular Army as the 70th Infantry.

Constituted 1 October 1933 in the Regular Army as the 49th Field Artillery.

The regiment was constituted on 1 July 1916 in the Regular Army as the 7th Field Artillery.

Constituted 1 July 1916 in the Regular Army as the 33rd Infantry.

First constituted 1916 in the Regular Army.

First constituted 1916 in the Regular Army as a cavalry regiment.