27th Infantry Division (United States)

27th Infantry Division (1917–55)
27th Armored Division (1955–68)
27th Infantry Division (1917–55); 27th Armored Division (1955–68)
	27th Infantry Division shoulder sleeve insignia. The red stars depict the Orion constellation, punning on the surname of the division's World War I commander John F. O'Ryan. The Red circle on the outside is an "O", also for "O'Ryan". The letters inside form the monogram "NYD", for "New York Division".
Active	1898 ; 1908–1919; 1921–1945; 1947–1968
Country	United States
Branch	United States Army
Type	Infantry
Size	Division
Nickname(s)	"O'Ryan's Roughnecks"; "New York Division"
Engagements	World War I Somme Offensive; Ypres-Lys; Meuse-Argonne; World War II Battle of Makin; Battle of Saipan; Battle of Okinawa; Iraq War (as 27th Infantry Brigade Combat Team)
Commanders
Notable; commanders	Major General John F. O'Ryan

The 27th Infantry Division was a unit of the Army National Guard in World War I and World War II.^[3] The division traces its history from the New York Division, formed originally in 1908. The 6th Division designation was changed to the 27th Division in July 1917.^[4]

^ Hart, Albert Bushnell (1920). Harper's Pictorial Library of the World War, Volume 5. New York: Harper & Brothers. p. 358.
^ Moss, James Alfred; Howland, Harry Samuel (1920). America in Battle: With Guide to the American Battlefields in France and Belgium. Menasha, Wisconsin: Geo. Banta Publishing Co. p. 555.
^ "World War II Divisional Combat Chronicles". history.army.mil. Retrieved 11 February 2024.
^ Wilson, John B. (1998). Maneuver and Firepower: Evolution of Divisions and Separate Brigades. United States Army Center of Military History. CMH Pub 60-14. Archived from the original on 26 December 2012. Retrieved 8 October 2012.

[1] Hart, Albert Bushnell (1920). Harper's Pictorial Library of the World War, Volume 5. New York: Harper & Brothers. p. 358.

[2] Moss, James Alfred; Howland, Harry Samuel (1920). America in Battle: With Guide to the American Battlefields in France and Belgium. Menasha, Wisconsin: Geo. Banta Publishing Co. p. 555.

[auto-3] "World War II Divisional Combat Chronicles". history.army.mil. Retrieved 11 February 2024.

[4] Wilson, John B. (1998). Maneuver and Firepower: Evolution of Divisions and Separate Brigades. United States Army Center of Military History. CMH Pub 60-14. Archived from the original on 26 December 2012. Retrieved 8 October 2012.

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27th Infantry Division (1917–55) 27th Armored Division (1955–68)
27th Infantry Division shoulder sleeve insignia. The red stars depict the Orion constellation, punning on the surname of the division's World War I commander John F. O'Ryan. The Red circle on the outside is an "O", also for "O'Ryan". The letters inside form the monogram "NYD", for "New York Division".^[1]^[2]
Active	1898 1908–1919 1921–1945 1947–1968
Country	United States
Branch	United States Army
Type	Infantry
Size	Division
Nickname(s)	"O'Ryan's Roughnecks" "New York Division"
Engagements	World War I Somme Offensive Ypres-Lys Meuse-Argonne World War II Battle of Makin Battle of Saipan Battle of Okinawa Iraq War (as 27th Infantry Brigade Combat Team)
Commanders
Notable commanders	Major General John F. O'Ryan