ɹˈaʊt wˈʌnhˈʌndɹɪd twˈɛnti wˈʌn pɹəɡɹˈɛst nˈɔːɹθwɚd θɹuː ðə juːnˈaɪɾᵻd stˈeɪts nˈeɪvəl ɹˌɛkɹiːˈeɪʃən ænd tɹˈeɪnɪŋ ˈɛɹiə dʒˈʌst tə ðə nˈɔːɹθ ʌv ɹˈaʊt fˈɪfti.
Route 121 progressed northward through the United States Naval Recreation and Training Area just to the north of Route 50.