Dee ihe na-esote paragraf a - Masters laghachiri Pearl Harbor isonye na 10th Defense Battalion na November 1942. Ka oge na-aga, dịka onye isi ndị agha nke battalion, nke e jikọtara ya na I Marine Amphibious Corps, ọ rụrụ ọrụ na Solomon
na Russell Islands. E buliri ya n'ọkwa lieutenant colonel n'ọnwa Eprel afọ 1943. N'ọnwa Ọgọstụ n'afọ ahụ, o duziri ndị agha nke abụọ nke ndị agha mmiri nke mbụ nwa oge na Australia tupu eweta ndị agha ahụ n'agha ọzọ site na Disemba 1943 ruo Febụwarị 1944 na Agha nke Cape Gloucester, ọzọ n'okpuru iwu nke Rupertus, ugbu a onye isi ndị isi nke 1st Marine Division.