Sgt. Maj. Laura L. Brown, Marine Corps University Enlisted Professional Military Education Adviser, explains the principles of the newly implemented Lance Corporal Leadership and Ethics Seminar in the Marine Corps Support Facility New Orleans auditorium, Aug. 27, 2014. Both “Leading Marines” and the seminar are required in order to be promoted to corporal, effective Oct. 1, 2015. - Sgt. Maj. Laura L. Brown, Marine Corps University Enlisted Professional Military Education Adviser, explains the principles of the newly implemented Lance Corporal Leadership and Ethics Seminar in the Marine Corps Support Facility New Orleans auditorium, Aug. 27, 2014. Both “Leading Marines” and the seminar are required in order to be promoted to corporal, effective Oct. 1, 2015.