Halon being tagged out wouldn't have influenced the outcome here. Lower V is not Halon protected. MMR1 below it is, but not V. The next closest Halon compartment would have been FWD EDG, which would have been beyond too late once the fire reached it. The AFFF system would have made short work of the fire, had it not been tagged out / in IEM -- definitely affected the fire attack.
I did two years on Iwo, and BZ to the Bonny crew. They did all they could have with those fire trees with plastic nozzles until help arrived.
BTW were you aboard the Iwo in 2005? I was a Marine deployed w/ SPMAGTF Katrina down there and we got “evacuated” on the Iwo Jima when another hurricane was bearing down on the area. It was a Marine battalion along with a lot of civilians. Don’t remember how long I was aboard but a few days certainly, before disembarking in norfolk or somewhere thereabouts.
I did two years on Iwo, and BZ to the Bonny crew. They did all they could have with those fire trees with plastic nozzles until help arrived.