This will be the second summer my son and I shoot ATA. We are from Nebraska and when attending registered shoots here we also need to have a membership in the NTA. (Nebraska Trap Ass.) We are planning to do a few shoots in Iowa this year as well and was wondering if there was a similar membership we would need to have besides our ATA to attend Iowa shoots. Is the ISTA membership only required for residents of Iowa and not for non-residents? Thanks!