I am not a Marine, I am Army. For me, something with a CIB and a 1st. Cav. patch would touch me the most I think.
With that said, can you find anything other than the Shadow Man that might point to some unit or another that he is particularly proud of and incorporate that?
My Son and his neighbor, both LE, make these things together as a hobby and build them to last. Only the finest of materials used. Built to last.
What started out as a hobby has grown and they make All kinds of Flags with different messages on them.
He made me a Colorado Flag that has in bold lettering,"Don't Californicate Colorado" on it. I like it, hanging on the fence for ALL to see.
If it were me, I would use a rectangular design rather that a cut out of the USA map as they are more durable and easier to touch up when needed. The Map can go within. Easier to hang and easier to maintain, Maine and Florida don't weather off.
I am not Pimpin my Son's skills nor trying to sell you anything but if you need our help, PM me and I am sure my Son will work with you to get what you want.
I don't think that only the Eagle Globe and Anchor is what you want as every Marine has that but something more personalized.
Regards, FM