 Sasebo was one of the original 17 targets selected for the dropping of the atomic bomb.After the end of the war, part of the base facilities were taken over by the United States Navy, forming U.S. Fleet Activities Sasebo.Some parts of the base are shared with the Japan Self-Defense Forces, in particular the JMSDF, though the primary base of the JGSDF's Western Army Infantry Regiment is also among the facilities there.