Staff Sgt. Valentin Monroy, the testing staff non-commissioned officer in charge, Academic Instructors Platoon, Support Battalion, walks up and down the aisles of the classroom during his class on Marine Corps History aboard Marine Corps Recruit Depot San Diego Aug. 16. The class was given to recruits of Company A, 1st Recruit Training Battalion, to further their knowledge of Marine Corps History and to provide insight on previous operations Marines have taken part in. - Staff Sgt. Valentin Monroy, the testing staff non-commissioned officer in charge, Academic Instructors Platoon, Support Battalion, walks up and down the aisles of the classroom during his class on Marine Corps History aboard Marine Corps Recruit Depot San Diego Aug. 16. The class was given to recruits of Company A, 1st Recruit Training Battalion, to further their knowledge of Marine Corps History and to provide insight on previous operations Marines have taken part in.