Description
Upon a blue shield approximately 2 1/2 inches (6.35 cm) in height the number “100” in round block letters, the upper half of the numerals white, the lower half yellow.

Symbolism
The blue shield represents Infantry; the numerals indicate the numerical designation of the Division.

Background
The shoulder sleeve insignia was originally approved for the 100th Division on 29 May 1923. It was redesignated for the 100th Airborne Division on 12 December 1946. The airborne tab was rescinded on 29 January 1947. The insignia was amended to add the airborne tab on 13 June 1951. It was redesignated for the 100th Infantry Division and amended to delete the airborne tab on 9 August 1956. The insignia was redesignated for the 100th Division on 7 September 1960. It was redesignated effective 16 September 2009, for the 100th Training Division and amended to add a symbolism. The insignia was amended to correct the redesignation date to reflect 16 September 2009. (TIOH Dwg. No. A-1-147)