Is the hyphen necessary in Japan-Okinawa Mission?
With the hyphen, the Japan-Okinawa Mission refers to the original mission headquartered in Kobe. The mission included the western half of Japan and the island of Okinawa (still owned by the United States). Without the hyphen, the Japan Okinawa Mission refers to a more recent (1990-1996) Japan mission that included the island of Okinawa (now a prefecture of Japan). Okinawa is currently a part of the Japan Fukuoka Mission.