[citation needed] During this time, young Okazaki began studying under a Yōshin-ryū jujutsu sensei by the name of Yoshimatsu Tanaka in Hilo, Hawaii.

Incorporating not only traditional jūjutsu, but also Lua, Shōrin-ryū Karate, Eskrima, Boxing, Chin Na and Folk Wrestling, he began to synthesize the most effective aspects of these various styles into an eclectic system which he called Danzan Ryū.

The FBI would also ask Bud Estes, who worked for Curley in the tile business, to assist in identifying drug dealers on another island during the harvest period.

[citation needed] Prof. Okazaki was also fortunate in that his dojo was unmolested, as his students protected it from looters who ransacked Japanese homes and businesses.

[citation needed] During wartime, Prof. Okazaki continued teaching and also assisted the US military in creating a hand-to-hand combat curriculum based largely on the 120 Commando Technique list.

Ironically, at the same time, Gichin Funakoshi, the father of modern Karate, was responsible for hand-to-hand training of many members of the Japanese military.

[2] The American Judo and Jujitsu Federation (AJJF) was founded in 1948 by Bud Estes, Richard Rickerts, John Cahill and Ray Law.

Small Circle Jujitsu™ evolved from combining many sources and elements, but owes its roots to Ken Kawachi, the Hawaiian judo champion for many years.

So effective was he in using the subtleties of the grip and its leverage that he routinely dominated other judoka twice his mass and defeated many visiting wrestlers and other grapplers from the mainland.

After a fighting career with more than 100 consecutive undefeated matches, Professor Nuuhiwa blended his real world fighting experiences, including death matches in Africa and Asia, with his training in Danzan-Ryu Jujitsu, Karate, Aikido, Makaho, and Lua, and started teaching self-defense classes under the name 'Kaito Gakko', a title he was given in Japan in 1958, upon receiving a 12th Dan in karate.

The Kodenkan Yudanshakai, founded in 1967 by Joseph Holck, is a traditional martial arts association with locations in major metropolitan areas of Arizona.

The Kodenkan Yudanshakai has grown over the years and presently has dojos in Arizona, Hawaii, California and Montana, including six in the Tucson-Phoenix metro area.

It was incorporated in 1987 in the State of California and has been instrumental in the creation and maintenance of several inter-organizational projects, including the Ohana weekends, the Danzan Ryu Hall of Fame and the H.S.

The Hawaiian leaders wished to perpetuate the traditions of the Kodenkan system while the statesiders wanted to update and improve their fighting skills to reflect certain modern realities.

That same year, Professors Kiehl, Ancho and Kufferath founded the Kodenkan Danzan Ryu Jujitsu Association or KDRJA.

To provide students with guidelines and a road map for understanding and practicing the ancient arts and sciences of Kodenkan Danzan Ryu Jujitsu as taught by H. Seishiro Okazaki.

OSS MARTIAL ARTS founded in Costa Rica by Sensei Ernesto Quesada, under Shihan Guillermo Guzmán who was a direct student of Prof. Ancho.

Shihan Randall Sanchez has run this center for more than 20 years in Costa Rica, providing rehabilitation and therapy to many athletes in the Central American region.

KODENKAN ITALIA founded by Sensei Marco Longo student of Daniel Saragosa AJI President and after learning and hold black belt in Kyokushindo, Kajukenbo, Kenpo Karate, Lima Lama, Hapkido and Jeet Kune Do Full Instructor.Kodenkan Italia Is the First and the only one DanZan Ryu Jujitsu Dojo located in Italy.

Bill Beach's Hawaiian Jiu-Jitsu System, Inc., as well as The Southern California Jujitsu Association founded in 1979 by James A. Marcinkus (deceased).

The goal of KaishinKai Dojo is to train quality instructors that will propagate the teachings of Henry S. Okazaki and the Kodenkan Danzan-ryu system of Jujitsu.

[citation needed] The Bushidokan Federation is a union of dojos from around the world practicing the art of Dan Zan Ryu Zenyo Bujitsu.

Member dojos are currently in Canada, Colombia, Ecuador, Israel, Italy, Russia, Saudi Arabia, Thailand, Serbia/Yugoslavia, and the United States (Alaska, California, Florida, Hawaii, Maine, Oklahoma, Georgia, and Nevada).

[5] Evolution Jujitsu was founded by Alex Aquino Sensei in Pasadena California 1995, as an answer to the rise of the mixed martial arts phenomenon in the US.

The focus of the group is simple: Use Danzan Ryu as a vehicle to go back to the combat tested roots of Jujutsu, and constantly evolve, and develop, through experimentation, and competition.

[citation needed] Zen Budokai Aiki Jujitsu was founded by Raymond "Duke" Moore who began his training in the 1940s with Ray Law.

With this goal in mind, Kilohana sponsors and supports a number of tournaments and training events throughout the year, most of which are open to members and non-members alike.

Ohana was founded in 1990 by Shoshin Ryu Yudanshakai instructors Mike Chubb, Bill Fischer and Roger Medlen, and is hosted by a different organization each time.

These two events, one in the summer of 1993 and one in the winter of 2003, brought a number of Danzan-Ryū instructors together to learn the system from Sig Kufferath and his senior student Tony Janovich.

The students who graduated from these classes were awarded Kaiden no Sho, or complete transmission certificates, and were given the title of either Renshi (trainer), Kyoshi (teacher) or Shihan (master).