Beware, Command may be like Prowl where flushing can actually reduce weed control. If rice has to be watered, flush, but if you get half-way normal rains Command won't need any flushing to work. There have been some instances where we had some grass escape on heavy soils under heavy rains. Sorry, but it doesn't turn red rice white. Basically there is no effect, although it can turn the leaves white.
Red rice is still botanically the same as white rice.