Sgt. Maj. Mark A. Byrd Sr., base sergeant major, Marine Corps Base Quantico, speaks Friday to the 23 Marines taking the inaugural Personal Readiness Seminar at the Chapel Annex. - Sgt. Maj. Mark A. Byrd Sr., base sergeant major, Marine Corps Base Quantico, speaks Friday to the 23 Marines taking the inaugural Personal Readiness Seminar at the Chapel Annex.