Most of us old guys in Tang Soo Do have a Jae Joon Kim connection.
I still use the purple, green, and red belt for color belts and have kept it that way. I hope you find a school and continue training. Master Nam kim, jj kims son use to run a school in saginaw that was before the move to fla there may be some instructore left in the area. Master Serrarto has a fine club in Grand Blanc which I just visited. a mixture of Tang Soo Do and hapkido. Grand Master Greg Bolliard heads the Musa Moo Duk Kwan Tang Soo Do federation with associate schools all over michigan and north as well, this may be where a lot of the old Kims Karate took direction. One of my students Master Church runs his Club in Wyoming Mi. were you ever present at the old Detroit headquarters at 6 mile and Grand River? had some great times there! My school and Tang Soo Do Martial Arts Society headquarters are in Lincoln Park Mi, but I have members throughout the state, I still use the origional belt system but have incorporated weapons training okinawan, japanese, korean and chinese, some of my dans are also dans in hapkido and jujitsu, my senior student trained with the gracies, we also incorporate a good mixture into the curriculim, break falls, joint locks, grappling. throws, submissions, along with bunkai and pressure points of the Tang Soo Do Hyung. I have and allways had an open door policy, all are welcome to visit and train for the day. If anyones ever in the area feel free to visit and share in the brotherhood!