The sixth Sōryū-class submarine, built by Kawasaki Heavy Industries, has been commissioned into service with the Japan Maritime Self-Defense Force on Mar. 9.
![C3150309_1[1]](http://www.milrecon.com/wp-content/uploads/2015/03/C3150309_11.jpg)
Photo: KHI
JS Kokuryū was handed over to Parliamentary Vice-Minister of Defense Kenji Harada at the ceremony attended by 200 people.
The cost of constructing SS-506 is around 53.4 billion yen and took four years.