blakamin:
As for foam... The Department of Environment and Water that run our national parks here in SA (and IIRC, the Country Fire Service) are phasing out foam extinguishers on their fire trucks and going straight powder. I'm not 100% on their reasoning (I just build their trucks) but for the last 8 months, we haven't fitted foam.
it will be this:
https://www.radionz.co.nz/news/national/349818/nzers-warned-over-toxic-foam-ticking-timebomb
we use different stuff for training now