391^st Infantry Regiment

The 391st Infantry Regiment was organized at Camp Breckinridge, Kentucky, on September 15, 1942, and assigned to the 98th Infantry Division. It moved with the division to the Tennessee Maneuver Area on September 7, 1943, then to Camp Rucker, Alabama, on November 20. The regiment staged at Fort Lawton, Washington, on April 17, 1944, sailed from Seattle on April 22, and arrived in Hawaii on April 28. Its wartime overseas service was spent in Central Pacific defense and invasion training rather than in combat.

The 391st was initially assigned to the Maui District. The division had arrived in Hawaii with the 389th on April 19, and the 391st followed nine days later to defend Maui while the 389th covered Kauai and the 390th later moved to Kauai and Oahu. This distribution reflected the 98th Division's role as a theater defense formation for the Hawaiian Islands. On November 2, 1944, the division was relieved of Kauai and Maui defense responsibilities and assembled on Oahu. The 391st was attached to Central Pacific Base Command from November 2, 1944, to March 31, 1945, and on March 18 it relieved the 389th Infantry in the Oahu defense mission.

The regiment did not fight before the end of the war. The division was released from Oahu ground defense responsibilities on May 31, 1945, after which it began intensive training. On July 28 the 98th was alerted for participation in the projected invasion of Japan, giving the 391st an assault preparation mission, but Japan surrendered before deployment. The regiment arrived in Japan on October 5 for occupation duty and was inactivated there on February 16, 1946.