THE MARINE RIFLEMAN WEAPONS MCI 03.72a1. Purpose. MCI course 03.72a, THE MARINE RIFLEMAN: WEAPONS, has been published to provide the individual rifleman with basic knowledge of weapons located at the fire team level.2. Scope. MCI course 03.72a emphasizes operator maintenance, assembly and disassembly, and immediate action procedures. This course also provides instruction on target engagement, grenades and pyrotechnic employment, and mine installation.