 Kunyange zvazvo yakamutswa pakupera kwehondo, battalion yacho pakupedzisira yaizoshumira mumakwikwi akawanda eAllied muNew Guinea, kusanganisira panguva yokurwisa New Britainuye Bougainville. Mushure mekugadzira muMarkham Valley, battalion yakaiswa paCamp Diddy, iri pedyo neNadzab muna Nyamavhuvhu 1944, kwavakagadzirwa mumakambani akati wandei epfuti, ayo akatsigirwa nekambani yedhipatimendi rekudzidzira. Muna Mbudzi 1944, PIB pamwe chete ne1st ne2nd New Guinea Infantry Battalions vakabatanidzwa kuti vagadzire Pacific Islands Regiment. Mamwe mapoka aizomutswa gare gare sezvo basa reuto reNew Guinea raizowedzerwa. 3rd ne4th New Guinea Infantry Battalions vakabatana nePacific Islands Regiment muna 1945, kunyange zvazvo 4 NGIB yakakurumidza kuparadzwa. Chimwe chikwata, 5th New Guinea Infantry Battalion - kunyange zvazvo chakanga chakabvumirwa - hachina kumbounganidzwa. 