100th Infantry Division (United States)

100th Training Division
100th Training Division shoulder sleeve insignia
Active	1918 – 1919 1921 – 1946 1946 – present
Country	United States
Branch	United States Army
Type	Training
Size	Division
Part of	United States Army Reserve Command
Garrison/HQ	Fort Knox, Kentucky, U.S.
Nickname(s)	Century[1] Sons of Bitche
Motto(s)	"Success in Battle"[2] "Soldiers of the Century"[3] "Train 'em Tough!"[4]
Colors	Blue and red
Engagements	World War I World War II Rhineland Ardennes-Alsace Central Europe
Commanders
Notable commanders	Withers Burress Andrew Tychsen
Insignia
Distinctive unit insignia

The 100th Training Division (Leader Development) (formerly the 100th Infantry Division) is a division of the United States Army headquartered at Fort Knox, Kentucky. It currently serves as a major training command of the United States Army Reserve. It has been known as the "Century Division" owing to its "100th" designation.

Throughout its long history, the division has taken on numerous roles. Serving as the 100th Infantry Division until the 1950s, the division then briefly became the 100th Airborne Division before becoming the 100th Division (Training). Since this transformation, the division has primarily taken on numerous training roles for other Army units.

It was originally activated in mid-1918, too late to join the fighting in World War I. The division is best known for its exploits during World War II as the 100th Infantry Division. Fighting in the European Theater, the division advanced through France and Germany through the end of the war, fending off heavy German counterattacks along the way. World War II would be the only war the division would see active combat in before taking on a role as a training unit.