Far more likely than a missile is the possibility that the ONLY entrance to Honolulu Harbor would be blocked by a sunken ship, whether accidental or intentional. This would halt more than 98% of all products destined to Hawaii (think milk, food, toilet paper, etc.).  The solution is to re-open the "back door" to the harbor by replacing Bascule Bridge with a draw bridge, like it used to have.  May never need to use it, but it would pay for itself.  Studies have shown it would take MONTHS (repeat, MONTHS) to remove any sunken ship from the harbor.  DOT Harbors is well aware of this vulnerability, but is using all their cash reserves (and borrowing) to build an unnecessary Kapalama Container Terminal for a single operator.