I can‘t resist..... to tie your soap info into the military.
During one of the final phases of soap making you can add soium and the glycerin in the soap will rise to the surface. (all your beauty bars that your wives, or you , use will have had that process skipped so that the glycerin remains as it has skin softening capabilities) During the industrial revolution many soap manufacturers became rich by this process selling the glycerin to the military for use in nitro-glycerin and other explosives.