Those 3000 troops will have very little to do with fire control - it’s not their bag. They’ll be a big part of the cleanup and recovery efforts, but basically the firies have to go in and do their thing, other agencies come in around or behind them to assist, but they’d be more of a hindrance than anything else if they tried to get involved in actual firefighting.
Couple of screenshots attached to give you an idea of what role the ADF has already been playing, and will continue to do (5 Bde is the formation I referred to earlier, I have been well aware for weeks that 4/3 RNSWR and their fellow 5 Bde units have been involved all over the place since the north coast copped it). Just as an aside - for all the hype, the ARes callout is essentially a funding & contracting issue more than anything. Plenty of reservists have already been using their allocated training days to assist, now they’ll get put on a continuous full time service contract instead.