U.S. Marines with I Marine Expeditionary Force Information Group, run during a martial arts instructor course physical training session at Marine Corps Base Camp Pendleton, California, Dec. 8, 2022. MAI courses certify Marines to instruct and monitor Marine Corps Martial Arts Program training and advance Marines in the program, distinguishing their levels of experience with different colored belts. - U.S. Marines with I Marine Expeditionary Force Information Group, run during a martial arts instructor course physical training session at Marine Corps Base Camp Pendleton, California, Dec. 8, 2022. MAI courses certify Marines to instruct and monitor Marine Corps Martial Arts Program training and advance Marines in the program, distinguishing their levels of experience with different colored belts.