A lokacin rani na 1943, abubuwa na 9th, 10th, da kuma 11th Defense Battalions sun goyi bayan rundunar soja ta XIV a tsakiyar
Yaƙin neman zaɓe na Solomons. A cikin 1944 ƙarin battalions sun taimaka wajen share tsibirin arewacin, ciki har da Bougainville. A ƙarshen 1943, Rundunar Tsaro ta Tsaro ta kai iyakar ƙarfin 26,685 Marines a fadin 19 Battalions. Yayin da barazanar da ke fuskantar cibiyoyin sojan ruwa ya ragu daga baya a cikin yaƙin, an dakatar da Battalions na Tsaro ko kuma an sake fasalin su a matsayin battalions na anti-aircraft.