Radar capability is interesting, but I'm curious if small balloons are really that hard of a target to shoot down once you've found it. They are slow-moving, non evasive, and virtually any impact from shrapnel will be a guaranteed kill. So it seems like you wouldn't even have to be that accurate, if the missile was designed to explode at its closest point.

That said, they did miss on the first attempt with the Lake Huron balloon, so I guess it's harder then I'd have thought.