Oh dear we went through this one a while back,
I contacted the Marines
YES.... you can use the word marine because the USA Marine's don't own the name,
what you can't do is refer to their logos sayings etc.
They cant copywrite the word Marine because it came from the days
when boats were first invented.
There is to much confusion of the actual Marine word and the Marine' usa guy told me:
Correctly stated Tanya, there are multiple "Marine" organizations in the world, if a card was created that said "I love my Marine" and it incorporated USMC branding such as our color pallet and words like "Semper Fi" then it would clearly be marketed as a U.S. Marine Corps product. Licensing would be required in this case.
We require licensing based on context in this case.... so stay away from the colours, but put the word Marine in whatever, stay away from Sampa Fi or whatever and no usa flag.
Its the words USMC branding, colour palate, Sempre Fi that makes it copywrite not the word marine.

lol this one always gets me.
And for the reviewers:
Jessica O'Haver
Program Manager
Marine Corps Trademark Licensing Office
www.marines.mil/trademark Headquarters United States Marine Corps
Public Affairs (PA) RM 4B548
3000 Marine Corps Pentagon
Washington DC, 20350-3000
Comm: 703-614-7678
DSN: 224-7678
Fax: 703-697-5362
Shes the one I wrote to.

Oh no i was flirting with a girl, I thaught she was a he, shame on me lol