40th Division Order of Battle, 1917
Former state unit designations are noted in italics
 
Headquarters Troop (Troop D, 1st Squadron, California Cavalry)

79th Brigade
157th Infantry Regiment (1st Colorado Infantry, 1st Colorado Cavalry)
158th Infantry Regiment (1st Arizona Infantry)
144th Machine Gun Battalion (elements of 1st New Mexico Infantry)
 
80th Brigade
159th Infantry Regiment (5th California Infantry, and elements of 2d California Infantry)
160th Infantry Regiment (7th California Infantry, and elements of 2d California Infantry)
145th Machine Gun Battalion (1st Squadron, California Cavalry)
 
65th Field Artillery Brigade
143d Field Artillery Regiment (1st California Field Artillery)
144th Field Artillery Regiment (2d California Field Artillery)
145th Field Artillery Regiment (1st Utah Field Artillery)
115th Trench Mortar Battery (Machine Gun Company, 2d Colorado Infantry)
 
115th Engineer Regiment (1st Colorado Engineers)
115th Field Signal Battalion (1st California and 1st Colorado Wire Companies)
115th Military Police Battalion (elements of 1st New Mexico Infantry)
115th Ammunition Train (elements of 2d Colorado Infantry)
115th Supply Train (elements of 2d Colorado Infantry)
115th Sanitary Train (later 115th Medical Regiment) (1st, 2d, 3d and 4th California Ambulance Companies, 1st and Second California, 1st Colorado, and 1st Utah Hospital Companies)
 
 
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Updated 8 February 2016