I remember several years ago that the Soviets/Russians had also made up some man-portable SADM, and they could not account for all of them. There was speculation where they could be and if in the collapse of the USSR, some enterprising fellow took it upon himself to sell them. I wonder if something like that requires periodic maintenance, or if some German farmer finds a cached bunker in the woods from 50 years ago, you could still light it off.