I think that Navy beer is 3.2 (3.2% alcohol) beer, which used to be served in the PX on military bases. Don't know if it still is.
I thought that Princess did serve heinekin, but not Corona, instead serving Dos Eqis (sp?). Could be wrong. But they do serve my favorite, Bass Ale, which I can't get on Celebrity. While I enjoy Corona, their commercials are better than their beer!