Re Posting #401. The 45th Division was organized and Federally recognized in the Oklahoma National Guard 3 August 1923. It was inducted into Federal service as 45th Division 16 September 1940 and redesignated 45th Infantry Division 11 July 1941. Under the nation-wide reorganization of the National Guard and Army Reserve in the late 1960's, it was reorganized and redesignated 45th Infantry Brigade, remaining an element of the Oklahoma National Guard.
Four regiments have held the designation 45th Infantry. The first was organized in 1814 and was consolidated with the Regiment of Light Artillery the following year. The second 45th Infantry was organized in 1866 and was consolidated with the 14th Infantry in 1869. The third was organized for service in World War I and was disbanded immediately after the armistice. The fourth was organized as an element of the Philippine Division in 1922 and captured at Corregidor in 1942. Reconstituted in 1947, it was disbanded in 1952.
There is no historical association or connection - nor could there possibly be - between the 45th Infantry and the 45th Infantry Division.