ɐ pɹˈiːviəs sˈɪstəm jˈuːzd baɪ ðə jˌuːˌɛsˌeɪˈɛf fɚðə sˈeɪm pˈɜːpəs wʌzðɪ ˈɛɹ fˈoːɹs spˈeɪs sɚvˈeɪləns sˈɪstəm, wˌɪtʃ sˈiːst ˌɑːpɚɹˈeɪʃən ɪn sɛptˈɛmbɚ tˈuː θˈaʊzənd θˈɜːtiːn.
A previous system used by the USAF for the same purpose was the Air Force Space Surveillance System, which ceased operation in September 2013.