1st Division (military)
The first division following military units at the level of division :
Infantry units
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 1st Guard Division (German Empire)
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 1st Guard Reserve Division
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 1st Division (German Empire)
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 1st Reserve Division (German Empire)
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 1st Landwehr Division (German Empire)
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 1st Marine Division (German Empire)
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 1st Royal Bavarian Division
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 1. Royal Bavarian Reserve Division
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 1st Royal Bavarian Landwehr Division
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 23rd Division (1st Royal Saxon)
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 23rd Reserve Division (1st Royal Saxon)
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 45th Landwehr Division (1st Royal Saxon)
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 26th Division (1st Royal Württemberg)
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 26th Reserve Division (Württemberg)
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 7th (Württemberg) Landwehr Division
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1st Division of the Reichswehr, see Division (Reichswehr)
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 1st Infantry Division (Wehrmacht)
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 1st Skijäger Division (Wehrmacht)
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 1st Air Force Field Division
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 1st Marine Infantry Division
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 14th Waffen Grenadier Division of the SS (Galician No. 1)
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 15th Waffen Grenadier Division of the SS (Latvian No. 1)
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 20th Waffen Grenadier Division of the SS (Estonian No. 1)
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 25th Waffen Grenadier Division of the SS "Hunyadi" (Hungarian No. 1)
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 27th SS Volunteer Grenadier Division "Langemarck" (Flemish No. 1)
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 29th Waffen Grenadier Division of the SS "RONA" (Russian No. 1)
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 29th Waffen Grenadier Division of the SS (Italian No. 1)
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 30th Waffen Grenadier Division of the SS (Belarusian No. 1)
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 33rd Waffen Grenadier Division of the SS "Charlemagne"
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1st Grenadier Division of the Bundeswehr, see 1st Panzer Division (Bundeswehr)
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 1st motorized rifle division of the National People's Army of the GDR - 
 1st Infantry Troop Division of the Austro-Hungarian Army - 
1st Division of the Austrian Armed Forces, see Armed Forces (1st Republic) # 1. division
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 1st Infantry Division (United States) of the US Army - 
 1st Marine Division of the US Marine Corps - 
 1st Division (Australia) , association in both world wars and until today - 
 1st Division (New Zealand) , association in World War II - 
 1st Canadian Division , Canadian Association, which was repeatedly activated since the First World War and in the meantime the 1st Canadian Infantry Division was designated - 
 1st Moscow Workers' Rifle Division (Soviet Union) , established around 1924 (and again in 1939), motorized since 1940, fought in the double battle near Vyazma and Bryansk , in 1941 renamed the 1st Moscow Motorized Guards Rifle Division (from 1943 to 1957 1st Guards Rifle Division), 1991 to 2002 1st Moscow Motorized Guards Rifle Division (Russia)
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 1st Guards Rifle Division , emerged in September 1941 from the 100th Rifle Division. Repositioned in Vologda in 1942 - 
 1st Guard Division (Japanese Empire) of the Imperial Japanese Army - 
 1st Division (Japanese Empire) , Association of the Imperial Japanese Army - 
 1st Division (Japan) , Association of the Japanese Ground Self-Defense Forces - 
 1st Infantry Division (Ottoman Empire)
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 1st Caucasian Infantry Division , Association of the Ottoman Army - 
 1st Infantry Division "Superga" (Kingdom of Italy)
 
Mountain Divisions
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 1st Mountain Division (Wehrmacht) , later 1st People's Mountain Division - 
 13th Waffen Mountain Division of the SS "Handschar" (Croatian No. 1)
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 21st Waffen Mountain Division of the SS "Skanderbeg" (Albanian No. 1)
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 1st Mountain Division (Bundeswehr)
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 1ª Divisione alpina “Taurinense”
 
Paratrooper and airborne units
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 1st Paratrooper Division (Wehrmacht)
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 1st Airborne Division , World War II - 
 1st Airborne Division (Bundeswehr)
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 Dai-1 Teishin Shūdan ("1st Air Storm Division"), Association of the Imperial Japanese Army in World War II 
Cavalry formations
- 1st Cavalry Division (German Empire)
 - 1st Cavalry Division (Reichswehr)
 - 1st Cavalry Division (Wehrmacht)
 - 1st Cossack Division of the Wehrmacht
 - 1st Cavalry Division of the Austro-Hungarian Army
 - 1st Cavalry Division (United States) (historically, now armored unit)
 - 1st Cavalry Division (United Kingdom) , association in World War I and from 1939 to 1941 as the predecessor of the 10th Panzer Division
 - 1st Cavalry Division (Russian Empire)
 - 1st Guard Cavalry Division (Russian Empire)
 - 1st Cavalry Division (Ottoman Empire)
 - 1st Cavalry Division (Kingdom of Italy)
 
Armored bandages
Armored divisions
- 1st Panzer Division (Bundeswehr)
 - 1st Panzer Division (Wehrmacht)
 - 1st SS Panzer Division Leibstandarte SS Adolf Hitler
 - Parachute Panzer Division 1 Hermann Göring
 - Panzer Division Feldherrnhalle 1
 
- 1st Armored Division (United Kingdom) , an armored division of the United Kingdom
 - 1st Armored Division (Australia) , an armored division of Australia
 - 5th Canadian Armored Division , an armored division originally set up as the 1st Canadian Armored Division
 
- 1st Armored Division (United States)
 - 1 re division blindée of the French army
 - 1 Dywizja Pancerna of the Polish Armed Forces in the West
 - 1st Panzer Division (Japanese Empire)
 - 1st Armored Division (Syria)
 
Other armored formations
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1st light division, see 6th Panzer Division (Wehrmacht)
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 23rd SS Volunteer Panzer Grenadier Division "Nederland" (Dutch No. 1)
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 28th SS Volunteer Panzer Grenadier Division "Wallonia"
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1st Panzer Grenadier Division of the Bundeswehr, see 1st Panzer Division (Bundeswehr)
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 1st Cavalry Division (United States)
 
Air Force Associations
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 1st Flieger Division (Wehrmacht)
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 1st Hunting Division (Wehrmacht)
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 1st Airman Training Division (Wehrmacht)
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 1st Aviation School Division (Wehrmacht)
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 1st Air Defense Division (NVA) of the GDR - 
1st Air Defense Division, later 1st Air Force Division of the Air Force of the German Armed Forces , see Air Force Division
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 1st Air Division (Japanese Empire) , Association of the Imperial Japanese Army Air Forces 
Other associations
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 1st Flak Division (Wehrmacht) - 
 1st Flak Headlight Division (Wehrmacht) - 
 1st Flak Division (Japanese Empire) , Association of the Imperial Japanese Army - 
 Mechanized Division 1