It is hard to find the four letters - NAVY anywhere in that museum. Laughable.
As long as you call yourselves “Marines” you are going to have that connection. Perhaps you should just call yourself “soldiers” like the Army, not “Marines.”
Since your museum depicts only Army-like ground warfare, distancing themselves from the Navy and the sea, maybe the Marines at Quantico ought to just go ahead and join the Army. They’d be glad to have you.