Not much is truly "old junk"—it's mostly serviceable, with new buys addressing Ukraine's high-consumption needs (e.g., 4,000+ shells/day).
Thanks! I appreciate the correction.
Something I kind of wonder about, not necessarily related but it could be... We've lost a LOT of the technology for making stuff as we move to more advanced stuff. Now that Beech is done making Bonanzas and Barons, what will happen to their jigs and plans and stuff. Too expensive to store, so will they be recycled? The molds for 155mm dumb projectiles when we go to all smart technology. Who will make new Merlin engines when we run out of the old ones? At the peak the US turned out one P51 every hour. Now it can take decades to refurbish one, never mind build a new one from scratch. Liberty ships in a couple of days. Not much shipbuilding here in the US any more. Let's bring chip manufacturing back here. But the chip making technology will take years to rebuild.
Yeah, I'm just rambling on here. But I do worry that the skills and technology to make old stuff are being forgotten. COBOL forever!