Beach patrons aboard Marine Corps Base Hawaii should avoid walking through, sitting and playing on the North Beach dunes. The dunes erosion are slowly being exacerbated by patrons and are an environmental concern. (U.S. Marine Corps photo by Lance Cpl. Adam O. Korolev) - Beach patrons aboard Marine Corps Base Hawaii should avoid walking through, sitting and playing on the North Beach dunes. The dunes erosion are slowly being exacerbated by patrons and are an environmental concern. (U.S. Marine Corps photo by Lance Cpl. Adam O. Korolev)