Japan’s Signals Intelligence (SIGINT) Ground Stations: A Visual Guide
https://nautilus.org/napsnet/napsnet-special-reports/japans-signals-intelligence-sigint-ground-stations-a-visual-guide/
http://www.japan-press.co.jp/s/news/?id=233
NSA: https://www.nsa.gov/what-we-do/signals-intelligence/
https://twitter.com/wikileaks/status/627012545157722112
The Worldwide Network of US Military Bases http://ow.ly/pjwS30iQY1r
http://www.asiamattersforamerica.org/japan/infographics/security-alliance
