Information from US Army CMH ETO Order of Battle and 1946 90th Infantry Division Divisional History
Background
90th INFANTRY DIVISION
"Alamo Division"
"Tough Ombres"
The division insignia consists of a monogrammatic red "T" and "O" on a square olive drab background. It was adopted by the 90th Division during World War I because most of its original personnel were drafted from Texas and Oklahoma.