[Suicide Junkie]

By now, everybody has different ideas about what a drone should be.

I figure it should be a cheap little ship, where you program a series of orders (move here, attack there, warp through the other place), then launch it, and it will follow those orders, self-destructing when it finishes.

Perhaps a cross between a unit and a ship, with no maintenance, and the ability to warp, but you can't change its orders once it has been launched.