less Company I, 6th Nebraska Infantry) 109th Engineer Train (Company I, 6th Nebraska Infantry) 109th Sanitary Train 133rd, 134th, 135th, and 136th Ambulance Companies and Field Hospitals (1st and 2nd Iowa Ambulance Companies, 1st Minnesota Ambulance Company, 1st and 2nd Iowa Field Hospitals, 1st Minnesota Field Hospital, ad 1st North Dakota Field Hospital) Between the world wars The units of the 34th Division returned to their home stations and reverted to their state designations, to prepare for the reorganization of the National Guard in the early 1920s. On 17 January 1921, the Observation Squadron, Minnesota National Guard, was the first National Guard observation squadron to receive federal recognition. Per War Department naming conventions, the squadron was re-designated the 109th Observation Squadron on 25 January 1923. Per the National Defense Act of 1920, the 34th Division was allotted the states of Iowa, Minnesota, North Dakota, and South Dakota, and assigned to the VII Corps in 1921. War Department policy mandated that National Guard division headquarters could not be organized and federally recognized until 75 percent of their intended subordinate units had been organized and federally recognized; the headquarters of the 34th Division was organized and federally recognized on 14 July 1924. On 16 May 1934, the truck driver's union initiated a strike (Minneapolis Teamsters Strike of 1934), which quickly degenerated into open violence in the streets of Minneapolis. Minnesota Governor Floyd B. Olson activated the National Guard and 4,000 guardsmen to suppress the chaos. Utilizing roving patrols, curfews, and security details, the 34th quickly restored order, thus enabling negotiated settlement of the labor dispute. On 18 June 1939, a tornado hit Anoka, Minnesota, and Governor Harold E. Stassen called on the Guard again. 300 Guardsmen patrolled the streets and imposed a quasi-martial law while the community was stabilized. Order of battle, 1939 Headquarters, 34th Division (Council Bluffs, Iowa) Headquarters, Special Troops (Council Bluffs, Iowa) Headquarters Company (Council Bluffs, Iowa) 34th Military Police Company (Aitkin, Minnesota) 34th Signal Company (Watertown, South Dakota) 109th Ordnance Company (Medium) (Minnesota National Guard) 34th Tank Company (Light) (Brainerd, Minnesota) 67th Infantry Brigade (Des Moines, Iowa) 133rd Infantry Regiment (Sioux City, Iowa) 168th Infantry Regiment (Council Bluffs, Iowa) 68th Infantry Brigade (Valley City, North Dakota) 135th Infantry Regiment (Minneapolis, Minnesota) 164th Infantry Regiment (Fargo, North Dakota) 59th Field Artillery Brigade (Minneapolis, Minnesota) 109th Ammunition Train (Minnesota National Guard) 125th Field Artillery Regiment (Duluth, Minnesota) 151st Field Artillery