ˌoʊvɚ ðə jˈɪɹz, ðə mˈɛmbɚʃˌɪp pˈuːl wʌz wˈaɪdənd tʊ ɪŋklˈuːd ˈɛnɪwˌʌn hˌuː hˌæd ˌɛni ɹᵻlˈeɪʃənʃˌɪp wɪððə fˈɛdɚɹəl ɔːɹ lˈoʊkəl ɡˈʌvɚnmənts, æz wˈɛl æz ðɛɹ ɛmplˈɔɪiːz, tʃˈɪldɹən, ɛtsˈɛtɹə.
Over the years, the membership pool was widened to include anyone who had any relationship with the federal or local governments, as well as their employees, children, etc.