Is DDG(X) replacing the Arleigh Burke class or the Ticonderoga class?
Short answerTiconderogas first, then older Burkes after the new design is established, with Burke construction continuing for some time.
NotesDDG(X) is expected to replace Ticonderoga-class cruisers first. Once the US Navy becomes comfortable with the design, later ships would probably begin replacing Arleigh Burke destroyers. Burke construction is expected to continue for some time during that transition.