Well, bones tell the game stuff like where projectiles, particles, spawns, and other things happen. You make a bone by making a sphere & making it so it has no sides, I think the lowest you can go is four I think. To make it a bone, when you export, check Export Transform (Bone) AND NOTHING ELSE! Infantry are way more complicated, but I would be willing to get into that if you really needed it.
Hopefully that helps.
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