High Quality Content by WIKIPEDIA articles! The 2nd Infantry Regiment is an infantry regiment in the United States Army that has served for more than two hundred years. It was constituted on 12 April 1808 as the 6th Infantry and carries the battle honors of the original 2nd Infantry Regiment extending back to March 1791. Since the formation of the original 2nd Infantry Regiment in 1791, there has been an active unit bearing the name "2nd Infantry" serving under every president from President George Washington until the present.