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Pete, it was the concepot of “stay-behind” troops and for locals which could start actions if an area got occupied.
Think of the CIA project “Gladio” in Europe.
The Germans used lots of captured equipment for such caches which also included many items which originally were air dropped by the allies to “their” saboteurs.
And as it still is today, when an armed formation is operating on foreign territory in this kind of environment it is always better to have other equipment than the own.
Again, some country we all know is doing this in extended perfection by just making up new items which are totally unknown (untill they will be compromised by use) and hardly can be traced.
This then allows for an independent supply (not having to capture stuff first) and also allows for tech. specs as per own requirements and not having to use what is around.
And I would not be surprised if similar items get made explicitely for one special operation and then never will be used again - depending on how sensitive the whole issue is.
I was told the GDR had such a project going with caches all over the former GDR territory which were highly classified and NOT documented as that would have contradicted the purpose. Means some of these caches (merely whole underground small-size bunkers with full equipment) are still to be discovered.