Iron Sharpens Iron Marine Corps Staff Sgt. Gunnar Weymer observes Marines during a martial arts instructor course at Marine Corps Recruit Depot Parris Island, S.C., Feb. 4, 2026. The course is designed to develop Marines' understanding of combative techniques and enables them to conduct belt advancement within individual units. SHARE: Download: Full Size (2.35 MB) Tags: training, marine corps Credit: Marine Corps Cpl. Jordy Morales VIRIN: 260204-M-JM917-1038Y.JPG Photo Gallery