I remember in a firefighting school I was sent to in the Navy that people could actually eat the foam ?? Don’t have a clue if it was a “ get me 20 yards of flight line” type thing or not but I saw a Salty ABMH( aviation boatswains Mate handler) Chief eat some

why would anyone chow down on any ? Foam , PKP for smaller fires, when combined with foam worked good. Light water was cool to see work. I was on a Crash and Salvage crew for a West Pac deployment , having to wear the gear in SE Asia heat & waters was brutal

So much so I wised up and changed rates before I was a E-4.
I was still on the flight deck a lot , but not in the Air Dept.