Collins was replaced by Jim Lovell in July 1968, after suffering a cervical disc herniation that required surgery to repair.
kˈɑːlᵻnz wʌz ɹᵻplˈeɪst baɪ dʒˈɪm lˈʌvɛl ɪn dʒuːlˈaɪ nˈaɪntiːnhˈʌndɹɪd sˈɪksti ˈeɪt, ˈæftɚ sˈʌfɚɹɪŋ ɐ sˈɜːvɪkəl dˈɪsk hˌɜːnɪˈeɪʃən ðæt ɹᵻkwˈaɪɚd sˈɜːdʒɚɹi tə ɹᵻpˈɛɹ.