I believe there are two USCA clubs in Jacksonville. If neither respond, I would call Patti Collins from the Fayetteville Club. She responds very quick to all emails and voice mails. Her husband is Arthur Collins and Art is the South Eastern Regional Director. Patti or Arthur will put you in contact with who you need to speak to in Jacksonville.
United Schutzhund Clubs of America ? Clubs
Good Luck and have fun with your dog!