Gunnery Sgt. Matthew Dike, the lead instructor for the Senior Drill Instructor Course, poses for a photo on Marine Corps Recruit Depot Parris Island S.C., Dec. 9, 2020. The Senior Drill Instructor Course is required for all drill instructors to become senior drill instructors on Parris Island. (U.S. Marine Corps (U.S. Marine Corps photo by Lance Cpl. Ryan Hageali)