
The 31st moved from Fort William McKinley to Manila, and there set sail for Vladivostok, Siberia, arriving on 21 August. Its mission was to prevent allied war material left on Vladivostok's docks from being looted. Russian Civil War ĭuring the Russian Revolution, on 13 August 1918, the 31st moved from Manila's tropics to the bitter cold of Siberia as part of the American Expeditionary Force, Siberia.
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It bears the distinction of being the first organization created under expansion of the US Army under the National Defense Act of 1916. The 1st Battalion was formed at Regan Barracks, the 2nd at Camp McGrath, and the 3rd at Fort William McKinley. The third organization called the 31st Infantry Regiment was formed at Fort William McKinley, Philippine Islands on 13 August 1916 using cadre from the 8th, 13th, 15th, and 27th Infantry Regiments. Because the lineage of the previous regiments called the 31st were passed down to their successor units, the current 31st Infantry Regiment does not share their history or honors. The second organization to be called the 31st Infantry was consolidated with its sister regiment the 22nd Infantry (also formed out of the 13th) in an 1869 reorganization. The second was created from the 3rd Battalion of the 13th Infantry on 28 July 1866, in the reorganization of the U.S. The regiment is the third to bear the designation the first was formed for the War of 1812 and disbanded in 1815.

The unit is rare in that it was formed and has spent most of its life on non-American soil.

The 31st Infantry Regiment (" Polar Bears" ) of the United States Army was formed on 13 August 1916, and was part of USAFFE's Philippine Division during World War II.
