It makes sense to add to our ballistic missile defense.  At the same token, I would add a missile defense system
on Guam as well.   I think that the real danger of missile attack would come from North Korea's missile capable
submarines which are quiet and hard to detect as was demonstrated when a North Korean sub sank a 
South Korean coastal patrol ship in March, 2010.  A North Korean sub could easily sneak in close and launch
their missiles and unless we had an anti missile system located on the islands themselves, there would be
no way to stop such an attack.  A missile defense system based in Alaska would be no help.