Apollo 11 was the second American mission where all the crew members had prior spaceflight experience, the first being Apollo 10.
ɐpˈɑːloʊ ɪlˈɛvən wʌzðə sˈɛkənd ɐmˈɛɹɪkən mˈɪʃən wˌɛɹ ˈɔːl ðə kɹˈuː mˈɛmbɚz hæd pɹˈaɪɚ spˈeɪsflaɪt ɛkspˈiəɹɪəns, ðə fˈɜːst bˌiːɪŋ ɐpˈɑːloʊ tˈɛn.