SNS3Guppy
Don't fly cargo anymore, but the C-5A (not the B-model) had 18 FE 1301 bottles that could flood the cargo and avionics areas with fire suppressant. It shouldn't be that hard to provide protection. We also had LN2 to inert the fuel tanks and flood the dry bays around the fuel tanks. They did get rid of it in the Bs, however.
GF