Welcome to the Isshin-ryu School of Karate The Isshin-ryu School of Karate has been an established member of the Hackettstown Community since 1979. hosts benefit tournaments yearly for charity and has done so since 1986. organizes classes for children from age 5 and also has flexible class schedules for adults. has 20 Black Belts, each with a minimum of 5 years of karate training. is organizing ...