CINIC / Fleet Activities Yokosuka (CFAY) http://cnic.navy.mil/regions/cnrj/installations/cfa_yokosuka.html
CFAY is a US Navy base which is supporting the USN 7th Fleet and the US-Japanese Alliance.
The base hosts US Forward Deployed ships of the 7th FLeet (a Command vessel, an aircraft carrier, a cruiser grp and a destroyer escort grp)
The base supplies logistic, recreational and administrative support and services of the US Naval Forces Japan.
Yokosuka ia also a Japanese Maritime Self Defense Force base hosting the Japanese Maritime HQ.
Search for NAV JPN/US Yokosuka