I te mutunga o te tau 1944, ko te 2nd, 5th, 8th, me te 16th Antiaircraft Artillery (i mua ko te Defense) Battalions i hangaia te 1st Provisional Antiaircraft Artillery Group hei whakarite ki te whakaeke i nga Moutere o Hapani. Ahakoa kaore i uru atu ki te Pakanga o Iwo Jima, i tau atu ratou ki Okinawa i te Paenga-whawha 1945. I muri tata iho, ka tukua atu a Hapanihi
i whakakorehia te nuinga o nga poari tiaki i te mea kua tino whakaitihia te rahi o te Marine Corps.