The backup crew assignment of Neil Armstrong as Commander, Lovell as CMP, and Buzz Aldrin as LMP for the third crewed Apollo flight was officially announced at the same time as the prime crew.
ðə bˈækʌp kɹˈuː ɐsˈaɪnmənt ʌv nˈiːl ˈɑːɹmstɹɔŋ æz kəmˈændɚ, lˈʌvɛl æz sˌiːˌɛmpˈiː, ænd bˈʌz ˈɔːldɹɪn æz ˌɛlˌɛmpˈiː fɚðə θˈɜːd kɹˈuːd ɐpˈɑːloʊ flˈaɪt wʌz əfˈɪʃəli ɐnˈaʊnst æt ðə sˈeɪm tˈaɪm æz ðə pɹˈaɪm kɹˈuː.