Captured equipment would be another idea so they can be pulled apart and studied.
Civilian refugees trying to get away from the war might be another.
Raw materials from areas captured from the enemy I could see happening, provided miners, etc were brought in to reopen operations and the areas were well enough protected. Raw material demand in wartime is quickly going to outstrip supply in most countries - take the UK in WWII, even shrapnel from enemy bombs during the blitz was collected up and recycled.
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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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