[raketenjagdpanzer]

This is what I myself would do (not suggest to anyone else, just do) about the LAV-75:

Way early on in the war the LAV75 was brought into the European theater in limited numbers. It'd had a lot of success in the middle-east against T55s and Soviet light armored vehicles, but was now being put in a new theater using new blitzkrieg style tactics against heavy Soviet armor and consequently was getting whalloped. AAI went back to the drawing board and produced the LAV-105-E (Europe) and a majority got quickly retrofitted. The balance of non-refitted LAV75s were kept back as rear area security.

When things went nuclear, and reinforcements were short, the '75 was pressed back into frontline service as an "MBT" and as standard M1s (mostly in the hands of National Guard units) began to run short of M68 ammunition, with lots and lots of 75mm HV ammo and turret kits for the LAVs available, as some were pulled back for maintenance they were re-converted back to the LAV-75 standard, especially those with damaged 105 turrets, rather than repaired as LAV-105s.

So circa summer 2000, there's plenty of LAV-75s still in the mix, as well as LAV-105s.