The 163rd Infantry Regiment of the Montana Guard formed part of the 41st Infantry Division, which fought through the Pacific during World War II. The Regiment was inducted into the Regular Army in September 1940, and were sent to Camp Murray at Fort Lewis, Washington. They participated in large-scale military exercises in California in 1941. On 7 Dec. 1941 small units were detailed to guard the Washington coastline from Japanese saboteurs. In March 1942 they were sent to Australia. Their engagements included the Battle of Buna-Gona in 1942–1943, the Salamaua-Lae campaign in 1943, Operations Reckless and Persecution and the Battle of Biak in 1944, and the liberation of the Philippines in 1945. In September 1945 the Regiment went ashore at Hiro, Japan as part of the occupation of that country. By this time most of the original Montanan troops had been discharged.