The Father of American Ninjitsu
Professor Duncan successfully demonstrated Ninjitsu in the 1960s, although receiving acknowledgement from the Japanese government, he was intentionally omitted from Black Belt magazine for several years.
Ninjutsu sometimes used interchangeably with the modern term ninpō is the strategy and tactics of unconventional warfare, guerrilla warfare and espionage purportedly practiced by the shinobi (commonly known outside Japan as ninja. Ninjutsu was a separate discipline in some traditional Japanese schools, which integrated study of more conventional martial arts (taijutsu) along with shurikenjutsu, kenjutsu, sojutsu, bōjutsu and others.
While there is a international martial arts organization representing several styles of modern ninjutsu, the historical lineage of these styles is disputed. Some schools claim to be the only legitimate heir of the art, but ninjutsu is not centralized like modernized martial arts such as judo or karate. Togakure-ryū claims to be the oldest recorded form of ninjutsu, and claims to have survived past the 16th century. Via https://www.facebook.com/photo.php?fbid=1406980529316823&set=gm.1461123217237005&type=3&theater