The 45th, along with the
57th Infantry Regiment, were the first two infantry regiments of the
Philippine Scouts which were formed after
World War I. The regiment was stationed at
Camp Gordon, Georgia, as of June 1919 as a separate regiment, and was transferred on 4 September 1919 to
Camp Dix,
New Jersey. It was then transferred on 25 October 1920, less enlisted personnel and equipment, to
Fort Mason,
California, and sailed on 5 November 1920 to the Philippines with officer cadre, records, and colors, aboard the
USAT Thomas. It arrived 2 December 1920 at
Manila, and transferred to
Fort William McKinley the following day, where it was reorganized as a Philippine Scout regiment by the assignment of the personnel and equipment of the inactivated 1st Philippine Infantry Regiment (Provisional). The 1st Battalion (minus Companies A and B) concurrently transferred to
Camp John Hay, while Companies A and B transferred to
Pettit Barracks. The regiment was assigned to the
Philippine Division on 22 October 1921. The regiment was most well-known for its participation in the
Battle of the Philippines (1941-42) during
World War II and their eventual surrender to Japanese forces on 10 April 1942. In 1946, the regiment, less the 1st Battalion activated as the 77th Infantry, was reorganized as the 45th Infantry, but was inactivated in 1948 and disbanded on 10 October 1951. ==Distinctive unit insignia==