The initial JMSDF OYASHIO system submarine premiered in 1998. 9 submarines finished up being taking solution in JMSDF till 2006. Two more associated with the program are building or on purchase, due to the tenth in the offing to repayment in 2007. The 268-foot submarines carry 20 torpedoes or UGM-84C Harpoon missiles, unlike the 3 past Japanese submarine classes, have actually actually bow-mounted torpedo pipelines and conformal sonar arrays.