Power sailed with his unit in mid-January 1944 from San Diego harbor, and on February 1, 1944, the 24th Marines participated in the assault at Roi-Namur in the Kwajalein Atoll, Marshall Islands. Roi was captured in short order and the surviving Japanese fled to nearby Namur. It was during the battle of Namur Island that Power was killed in action when he charged a Japanese pillbox despite a severe stomach wound.