There have been a number of 19th Divisions in the history of the United States Army.
19TH INFANTRY DIVISION NATIONAL GUARD WWI ERA SSI19th Division: A National Guard division established in early 1917 consisting of Arizona, California, Colorado, Nevada, New Mexico, and Utah. By the end of that same year, the 19th Division became the 40th Division (later 40th Infantry Division).
World War I
The 19th Division was organized on 1 September 1918 as a Regular Army and National Army division for service in the American Expeditionary Force from a mixture of existing and newly-raised units, however the division did not go overseas and demobilized in February 1919 at Camp Dodge, Iowa.[1]
The 19th Division gained the nickname "Twilight Division" and was composed of the following units, not all of which joined before the Armistice:[2]
19th Field Artillery Brigade (55th Field Artillery, 56th Field Artillery, 57th Field Artillery)
219th Engineer Regiment
19th Trench Mortar Battery
World War II
The 19th Armored Division was constituted in the Army of the United States on 18 January 1943, however, it was never officially activated during the war.
The "19th Infantry Division" was a "phantom division" used as part of Allied deception measures. It was notionally assigned to SHAEF for use in Operation Fortitude South, but was never actually utilized during that endeavor.
The division's order of battle included the following fictional units:
Headquarters, 19th Infantry Division
572nd Infantry Regiment
573rd Infantry Regiment
578th Infantry Regiment
Divisional Troops
In July 1944, it was redesignated as the 109th Infantry Division.
Cold War
On 1 July 1946, the 19th Armored Division was allotted to the Organized Reserve. The headquarters was activated on 15 January 1947 at Los Angeles, California, and the Headquarters Company was activated on 1 July 1947. Both units were inactivated on 20 August 1947 and reflagged as the 13th Armored Division and activated the next day. The 19th Armored Division was disbanded on 21 March 1952.