 At that time, the division was referred to simply as the 40th Division because there were no armored or cavalry divisions.On 24 September 1917, the 2d Infantry Regiment (less the 2d Battalion, Companies L and M, and the Sanitary Detachment) was consolidated with the 5th Infantry Regiment (California) and redesignated the 159th Infantry Regiment, 40th Division.On 25 September 1917, the 2d Infantry Regiment's 2d Battalion, companies L and M, and the Sanitary Detachment were consolidated with the 7th Infantry Regiment (California) and redesignated the 160th Infantry Regiment, 40th Division.