In June 1943 , after its defeat in the Guadalcanal Campaign , the IJN realized it needed high - speed military transport vessels .
In June 1943 , after its defeat in the Guadalcanal Campaign , the IJN designed two classes of ship in response .
In June 1943 , after its defeat in the Guadalcanal Campaign , the IJN realized it needed high - speed military transport vessels , and designed two classes of ship in response .