In 1940, the 1st Infantry Division converted to a "triangular" structure with a complement of about 14,000 soldiers assigned to various units. The division's units were a headquarters, the 16th Infantry Regiment, 18th Infantry Regiment and 26th Infantry Regiment, battalions of the 5th Field Artillery Regiment, 7th Field Artillery Regiment, 32nd Field Artillery Regiment and 33rd Field Artillery Regiment and the 1st Reconnaissance Troop with support by the 1st Medical Battalion, 1st Quartermaster Company, 1st Signal Company and 1st Ordnance Company. In the Sicily Campaign, the division mixed infantry and armor and also supported the combat teams with the division's artillery and combat service support units. Tank and tank destroyer companies later were directly assigned to the regiments for campaigns in France.