Kammala wannan jumla: An ba da umurni a tsakiyar 1942, "Musashi" an canza shi don zama babban jirgin ruwan Sojan Ruwa, kuma ya ciyar da sauran shekara yana aiki. An tura jirgin zuwa Truk a farkon 1943 kuma ya yi sau da yawa a wannan shekara tare da rundunar jiragen ruwa a cikin binciken da ba a yi nasara ba ga sojojin Amurka. An yi amfani da shi don canja wurin dakarun da kayan aiki tsakanin Japan da tsibirai daban-daban da aka mamaye sau da yawa a 1944. A farkon 1944 wani jirgin ruwa na Amurka ya fashe shi, "Musashi" ya tilasta komawa Japan don gyarawa, yayin da sojojin ruwa suka kara yawan makamai masu linzami. Ta kasance a lokacin yakin Philippine Sea a watan Yuni, amma ba ta shiga hulɗa da sojojin Amurka ba. A lokacin da
Yaƙin Gulf na Leyte, "Musashi" an nutsar da shi ta hanyar kimanin 19 torpedo da 17 bom hits daga jirgin sama na Amurka da ke da jirgin sama a ranar 24 ga Oktoba, 1944. Fiye da rabin ma'aikatanta sun sami ceto. An gano jirgin ruwanta a watan Maris na 2015 ta ƙungiyar masu bincike da ke aiki da Paul Allen, wanda ya kafa Microsoft.