ðə jˌuːˌɛsˈɛn ˈɔːɹdɚd twˈɛnti θɹˈiː slˈæʃ sˈɛvənti ˌeɪˈeɪ tˈɜːɹɪts jˈuːzɪŋ ðə sˈeɪm ˌæmjuːnˈɪʃən æz ðɪ ˌɑːɹɹˈɛn slˈæʃ ˌɑːɹsˌiːˈɛn mˈaʊnt ænd ðə jˌuːˌɛsˈɛn ˈæktʃuːəli fˈɪɾᵻd ðə ɡˈʌn tə jˌuːˌɛsˈɛs nˈɔːɹfək, fˈoːɹ mˈɪtʃɚ dˌiːdˌiːˈɛl ænd sˈɛvɹəl ɡˈɪɹɪŋ fɹˈæm wˈʌn dᵻstɹˈɔɪɚz bˌʌt fˈaʊnd ðə mˈaʊntɪŋ sˌoʊ dˈɪfɪkəlt ðeɪ nˈɛvɚ fˈaɪɚd ðə ɡˈʌnz æɾ ˈɔːl wˌaɪl ðeɪ wɜːɹ ɪnstˈɔːld ɔnðə jˌuːˌɛsˈɛn dᵻstɹˈɔɪɚz.
The USN ordered 20 3/70 AA turrets using the same ammunition as the RN/RCN mount and the USN actually fitted the gun to USS Norfolk, 4 Mitcher DDL and several Gearing Fram 1 destroyers but found the mounting so difficult they never fired the guns at all while they were installed on the USN destroyers.