The land-based variant of the JL-2 was originally called the DF-23 but was changed later on to the DF-31 because of a change in operational requirements.
ðə lˈændbˈeɪst vˈɛɹiənt ʌvðə dʒˌeɪˈɛl tˈuː wʌz ɚɹˈɪdʒɪnəli kˈɔːld ðə dˌiːˈɛf twˈɛnti θɹˈiː bˌʌt wʌz tʃˈeɪndʒd lˈeɪɾɚɹ ˌɔn tə ðə dˌiːˈɛf θˈɜːɾi wˈʌn bɪkˈʌz əvə tʃˈeɪndʒ ɪn ˌɑːpɚɹˈeɪʃənəl ɹᵻkwˈaɪɚmənts.