I asked "chat" and got this response-
The 23rd Infantry Regiment is an infantry regiment in the United States Army. It was formed on June 26, 1812 and saw action in 14 battles during the War of 1812. In 1815, it was consolidated with the 6th, 16th, 22nd, and 32nd Regiments of Infantry into what is at present the 2nd Infantry Regiment. The modern 23rd Infantry regiment was formed during the American Civil War and has seen action in American wars up to the US War in Afghanistan and the Iraq War.