In 1941 the National Guard of the United States was mobilised for active service. The 38th Tank Company was detached from the 38th Infantry Division to become Company D of the 192nd Tank Battalion. Arriving in the Philippines in late 1941, the company engaged in combat during the Japanese invasion and the US retreat to the Bataan Peninsula; being part of the force that surrendered to the Japanese. A cavalry regiment, the 123rd Cavalry was made part of the 22nd Cavalry Division and served in the Continental United States. The 38th Infantry Division fought in the Philippines Campaign from 1944 to 1945.