Regs state: "Naval personnel who have received awards from other military services or departments of the United States Government, foreign governments, or other agencies, may wear such awards on the naval uniform only as described in this section." All this means is that you must wear your awards in line with their order of precedence.
You are allowed to wear your AF Outstanding Unit Award, Air Reserve Forces Meritorious Service Medal, AF NCO PME Ribbon, AF Expeditionary Service Ribbon, and the AF Training Ribbon. I would avoid state awards and place your awards as described by the regulation which will really impact you once you receive your marksmanship ribbons. Also, why no National Defense Service Medal? If you have expeditionary service you were on active duty...if you were on active duty, you have earned that "starter" decoration.
My advice is get a new rack ready, you are going to take some flak from the Marines, but that is part of the deal. Be proud and know exactly why you earned each ribbon...they will ask.
Enjoy OCS!