The History of this belt comes from the Tracy's Kenpo Karate home page
Green Belt was introduced to the martial arts in 1962, along with the Orange, Purple Belt and Blue Belts, and as Yonkyu became the highest rank before the Kenpo Karate Brown Belt. The old Yonkyu, which was two brown tips, no longer existed in Kenpo, as Ed Parker accepted the new Tracy Kyu ranking and gave 4 brown tips for Yonkyu, until adopting the Tracy Color Belt system in 1965. Green Belt required a total of 228 Kenpo karate techniques and variations as well as forms. Tracy Kenpo Green Belts were among the best martial arts competitors in the white - brown belt category, and Ed Parker often gave black belts to Tracy Green Belts. One Tracy Green Belt was given 5th degree black belt when he went with Ed Parker, and the disparagy between Tracy and Parker belt ranks caused many Tracy blue and green belts, and brown belts to go over to Ed Parker where they could get immediate, black belt ranks. During the 1970s, nearly 80% of Ed Parker's top black belts had first been black belts in Tracys.
Tracy Green Belt were often required to compete as black belts in tournaments. The techniques for Green Belt complete the basics for beginning Kenpo, and are used as exercises for physical conditioning. Like Orange Belt, Purple Belt and Blue Belt, many of the moves have been adopted by aerobics.