I'm pretty sure I've seen and heard big choppers like this one flying over Kumamoto. According to the article, however, more should have been available.
-- Kirk
http://newsonjapan.com/html/newsdesk/article/116299.php
80% of SDF big choppers couldn't fly for Kumamoto
About 80 percent of the Self-Defense Forces' CH-47 large transport helicopters could not fly on relief missions after the Kumamoto Earthquake, mainly because they were undergoing emergency checks, according to sources.