Looks like bad weather and some sort of gliche is a huge advantage to any "axis of evil" wanted to get a missile past the missile defence. Nothing has ever shot down a missile. It doesn't work. Canada would be a chump if we threw our tax dollars into this mess.
http://www.cbc.ca/story/world/national/2004/12/15/missile-defence-041215.html
http://www.cbc.ca/story/world/national/2004/12/15/missile-defence-041215.html