Don't forget though that there's likely to be a lot of pre-war Vasilek's floating about and that there may not be a pressing need to make more tubes. A unit may be able to make do with the tubes they already have, due to their reduced manpower as the war grinds on. Of course that doesn't account for tubes captured by enemy action, destroyed when the unit is nuked, etc...
Wear and tear may also be a factor, but I doubt it's going to be as influential as the others.
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
Mors ante pudorem
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