The XXIII Corps Shoulder Sleeve Insignia, or unit patch, features a blue-bordered oval with a field divided into blue and white halves and containing three crossed arrows in the center, with the color of the arrows countercharged against the field. Blue and white are the colors used for Corps flags, and the trio of arrows symbolizes the military strength. The two halves of the oval stand for the two Roman numerals “X” and the arrows each represent the Roman numeral for one, combining to form the Corps numerical designation of XXIII, or 23.
Activated on 15 January 1944 at Camp Bowie in Texas, the XXIII Corps did not see combat during World War II despite being attached to Fifteenth Army, which did have a few units that engaged the enemy. Instead, it served as an occupying and temporary military government force in southwest Germany. On 10 July 1945, XXIII Corps handed the area over to the French Army and was subsequently awarded a World War II European Theater Campaign streamer without an inscription.