wˈɔːkɚ spˈɛnt ˌoʊvɚ twˈɛnti θɹˈiː jˈɪɹz ɪnðə jˈuː.ˈɛs. nˈeɪvi, sˈɛvəntˌiːn jˈɪɹz ˈæktɪv ænd sˈɪks ɪnðə nˈeɪvəl ɹɪzˈɜːv ɹˈiːtʃɪŋ ðə ɹˈæŋk ʌv kəmˈændɚ.
Walker spent over 23 years in the U.S. Navy, (17 years active and 6 in the Naval Reserve) reaching the rank of Commander.