U.S. Marine Corps Sergeant Major of the Marine Corps Sgt. Maj. Troy E. Black speaks with Marines, Sailors and civilians during the Enlisted Professional and Personal Development Summit at Marine Corps Base Quantico, Va., Feb. 3, 2020. The attendees were solicited to provide the Commandant of the Marine Corps with opinions and recommendations on how to improve education, health, recruitment, and retainment of Marines in a professional environment. - U.S. Marine Corps Sergeant Major of the Marine Corps Sgt. Maj. Troy E. Black speaks with Marines, Sailors and civilians during the Enlisted Professional and Personal Development Summit at Marine Corps Base Quantico, Va., Feb. 3, 2020. The attendees were solicited to provide the Commandant of the Marine Corps with opinions and recommendations on how to improve education, health, recruitment, and retainment of Marines in a professional environment.