Talk:S-51J/@comment-30538704-20190327231949/@comment-32647310-20190328145534

There were (to my knowledge and brief searches over the internet) no S-51j's. That is not what the JMSDF called them, and that is not what Sikorsky called them.

This is not to say that the company that made and then sold them to Japan didn't call them 'S-51j' to indicate that they were for a Japanese customer or that they were altered from the American/British designs to reflect Japanese sensibilities (such as kanji on the guages and such)...

...but more than likely, the devs just slapped a 'j' on it much in the same way they throw 'Kai' on other non-Japanese equipment in-game.