proven that capability. I have great confidence in that capability," he said.

The commander of the Hawaii-based fleet admitted the system is "very expensive" but said it is because of the advanced nature of the technology involved and that he is pleased with the progress in developing the capability together with Japan.

Concerning the Japanese government's intention to study the possibility of easing its self-imposed ban on the exercise of the right to collective defense to protect allies under attack, Roughead declined to comment directly but emphasized the importance of prompt information-sharing between the two countries in the event of a missile attack.

"The approach and the process that the Japanese government is going through in that regard is really a matter for the Japanese government to work through and think through," the 1973 U.S. Naval Academy graduate said.