ブーゲンビル島の戦い
Hansen volunteered for the Paramarines, which were formed in 1942, and became a Marine parachutist. He fought in the Bougainville Campaign in 1943. In February 1944, the Paramarines were disbanded and he was transferred to Third Platoon, Company E, 2nd Battalion, 28th Marines, 5th Marine Division at Camp Pendleton, California.