The Clockwork Garrison says it'll pick up broken Warriors, but I can't figure out how.
The Garrison itself only seems to have the ammo inventory, and trying to unload with an inserter only unloads ammo.

It tosses a carcass somewhere nearby the tower. You need to surround it in belts to catch them. Otherwise you would need to go collect them from the battlefield. It's a little silly and I wish I had a better way to do it but programming it is a pain.

I think it's kind of fun to collect all those bleeping barrels though.

One problem I found is that sometimes they'll drop within the boundaries of the tower itself, so even belts can't grab it.

A boring but practical solution might be to have it output like a miner does?

I've improved the "drop stuff on the ground" logic in the latest release. It's not foolproof but is much more likely to land on belts.