Years ago, before the National Museum of the Marine Corps opened in Quantico, the Marine Corps museum was in a tiny two story building at the Washington Navy Yard, a couple of blocks away from 8th and I.
I visited that small museum once upon a time, and on the second floor were both flags flown over Suribachi. I remember thinking they both seemed kinda small.
I visited the same place at the Navy yard. I tend to prefer out of the way places, which that was.