There was a company that built a simple fuel tank fire suppression system.
It was essentially a flat dry-chem extinguisher. Any force big enough to punch through the extinguisher and rupture the fuel tank would have instantly opened the extinguisher and stifled a fire or explosion before it even got started.
Cheap, compact and easily bolted on to existing inventory.
The Pentagon Perfumed Princes rejected it. It’s only 80% effective.
Go to any National Cemetery or VA hospital. Count the combat vehicle burn victims and imagine that 8 out of 10 were never burned in the first place...
I guess the contractors who gave more to politicians won out with the halon system.....