Photos and videos posted by members of the USGTSDA. The United States Goodwill Tang Soo Do Association was established in the year 2000 by David L. Sgro, Kwan Jang (San Kil Tang Soo Do) and Steven J. Voelker, Kwan Jang (Pyong Hwa Kunin Tang Soo Do). The USGTSDA is not a political organization, but rather an event driven Association. Tang Soo Do schools are encouranged to participate in the USGTSDA events and still maintain membership in their respective Association; in fact, all members of the USGTSDA are members of their respective Associations! So, the USGTSDA is really an Association of Associations.