Yeah, that's what I assumed they'd be for. Obsolete, or more likely salvaged from a junk yard, vehicles plunked on whatever carriage is available. I doubt they'd be used for convoy actions (though the Yugo wars/ other ones in the region had all sorts show up). The BMP-2 turret one's been perplexing me, as to whether its the whole upper hull of the donor vehicle, or everything's fabricated barring the turret.
Heh, and I'm waiting on that BTR-80 showing up from you Cuprum as its where I'm taking the turret from for this. Shouldn't be too difficult to scratchbuild one, but I'll have a spare turret leftover from making a BTR-3 out of those Chinese toys.