Such a design has three major advantages over conventional military designs. The entire reaction cycle occurs much faster so it breeds new fuel at a faster rate, it can use a wider variety of breeding materials because it is not used as the fuel as well, and it also generates ample amounts of heat, which can be used to produce power. The downside is that it has to be fueled with some sort of enriched fuel, although the fissile material being bred in the blanket can be used.