Sgt. Jack Latham, enlisted squad advisor for 5th Platoon of Charlie Company at The Basic School, guides lieutenants in Marine Corps Martial Arts Program training. Charlie Co. is the school’s first company to incorporate enlisted Marines from the Combat Instructor Company of the former Support Battalion into its companies of student lieutenants. - Sgt. Jack Latham, enlisted squad advisor for 5th Platoon of Charlie Company at The Basic School, guides lieutenants in Marine Corps Martial Arts Program training. Charlie Co. is the school’s first company to incorporate enlisted Marines from the Combat Instructor Company of the former Support Battalion into its companies of student lieutenants.