Can i switch from Reserves to Active Duty in the Marine Corps?

If i can switch from Reserves to Active Duty do i keep the MOS i was in the Reserves or do i get assigned a new one? My plan is since you can only pick your MOS field in Active Duty, i was going to go to Reserves where you can pick your MOS and then transfer to Active Duty with the MOS i picked. Will this work?
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