Tri-City used to be a sanctioned club with USPSA. They even hosted a State match or two. (won a 10-22 barrel at one)
Greg Lamb was a major contributor to their matches, but he moved out of state.
OKCGC formed while Tri-City was still sanctioned and picked the same day to run their matches. (due to OKCGC scheduling constraints) This didn't sit well down south. Eventually the match day was changed, but the damage had been done.
As I recall Albert telling me, they had a discussion about reaffiliating with USPSA, but didn't think it was worth it to them. They decided to run "IPSC-type" matches instead.