U.S. Fleet Activities Yokosuka, or Commander, Fleet Activities Yokosuka is a United States Navy base, in Yokosuka, Japan. Its mission is to maintain and operate base facilities for the logistic, recreational, administrative support and service of the U.S. Naval Forces Japan, U.S. 7th Fleet and other operating forces assigned in the Western Pacific. CFAY is the largest strategically important U.S. Naval installation in the western Pacific. , it is commanded by Captain David Glenister.