U.S. Marine Corps 1st Lt. Amos R. Mason, Head of Naval Enlisted Programs, guides a naval sea cadet on how to properly use a compass at Marine Corps Base Quantico, Oct. 23, Va. Marine Corps Recruiting Command volunteered to provide mentorship and training during the U.S. Naval Sea Cadet Corps' three-day field training exercise. - U.S. Marine Corps 1st Lt. Amos R. Mason, Head of Naval Enlisted Programs, guides a naval sea cadet on how to properly use a compass at Marine Corps Base Quantico, Oct. 23, Va. Marine Corps Recruiting Command volunteered to provide mentorship and training during the U.S. Naval Sea Cadet Corps' three-day field training exercise.