Michigan Carpenters Union carpenters and millwrights receive extensive training in state-of-the-art methods and equipment during a four-year apprenticeship to become fully certified by the Michigan Carpenters AFLD. Michigan Carpenters Union carpenters and millwrights receive extensive training in state-of-the-art methods and equipment during a four-year apprenticeship to become fully certified by the Nationalskillbook.