ˌɔn dʒuːlˈaɪ sˈɛvəntˌiːn, wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd sˈɪksti sˈɪks, pɹˈɛzɪdənt dʒˈɑːnsən nˈɑːmᵻnˌeɪɾᵻd ɡɹˈɛɡ fɔːɹ ɐpˈɔɪntmənt tə ðə ɡɹˈeɪd ʌv bɹˈɛvɪt bɹˌɪɡɐdˈɪɹ dʒˈɛnɚɹəl ɪnðə ɹˈɛɡjʊlɚɹ ˈɑːɹmi tə ɹˈæŋk fɹʌm mˈɑːɹtʃ θˈɜːtiːn, wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd sˈɪksti fˈaɪv, ænd ðə jˈuː.ˈɛs. sˈɛnət kənfˈɜːmd ðə nˌɑːmᵻnˈeɪʃən ˌɔn dʒuːlˈaɪ twˈɛnti θɹˈiː, wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd sˈɪksti sˈɪks.
On July 17, 1866, President Johnson nominated Gregg for appointment to the grade of brevet brigadier general in the regular army to rank from March 13, 1865, and the U.S. Senate confirmed the nomination on July 23, 1866.