Never as a regular posting as I wasn't a sailor or a ship stationed sensor tech, my experience in the Navy was with EMSEC and electronic systems; I was shore borne. I have worked on the Aegis baselines, conducted certification on the seekers for the SM-3, SM-6 and ESSM and helped reduce or shield communications gear from too much electronic leakage, but I was never a permanent feature on board a ship. I've been on destroyers, Japanese one's too, but it was always for a few days a most.
Anything Navy related and electronic involved was something I was going to have a hand in. My only two trips to Japan, both for just a week and neither allowing me to see the sights
, where all for certification and integration of new systems, i.e., coastal radar, missile assets, joint Japanese-US communications gear.