The 0369 Infantry Unit Leader MOS is a primary MOS for Staff noncommissioned officers in the infantry. Marines can promote into this MOS from the primary MOS's of 0311 Rifleman, 0331 Machinegunner, 0341 Mortarman, 0351 Infantry Assault Marine, 0352 Antitank Missile Gunner, and 0365 Infantry Squad Leader. 0369's primarily serve as platoon sergeants in rifle and weapons platoons, as well as operational and logistics roles in infantry companies.
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The Infantry Unit Leader is responsible to the commander and assists in the planning, training, deployment and employment of all infantry organic weapons systems and the units combat power capabilities.