Sgt Private RallyPoint Member 6514147 <div class="images-v2-count-0"></div>Prior Marine Corps Sgt. How does one in the IRR apply to OCS? The Enlisted to Commission MCO states a Marine in the IRR would apply for OCS through manpower, MarForces Reserve. What does this mean exactly? Marine Corps IRR to OCS? 2020-11-19T13:24:35-05:00 Sgt Private RallyPoint Member 6514147 <div class="images-v2-count-0"></div>Prior Marine Corps Sgt. How does one in the IRR apply to OCS? The Enlisted to Commission MCO states a Marine in the IRR would apply for OCS through manpower, MarForces Reserve. What does this mean exactly? Marine Corps IRR to OCS? 2020-11-19T13:24:35-05:00 2020-11-19T13:24:35-05:00 2020-11-19T13:24:35-05:00