  A vector model with a hybrid form of spacetime symmetry breaking consisting
of explicit diffeomorphism breaking but spontaneous local Lorentz violation is
presented. The combined effects of these symmetry breakings give rise to a
theory obeying the Einstein-Maxwell equations in a preferred spatially
homogeneous and isotropic frame, with photons emerging as massless
Nambu-Goldstone modes. Interpretations and possible generalizations of this
model are discussed, and comparisons are made to previous models describing
photons as Nambu-Goldstone modes.
