  We summarize recent developments in the prediction for $\alpha_s(M_Z)$,
self-consistent string unification and the dynamical determination of mass
scales, and leptophobic $Z'$ gauge bosons in the context of stringy flipped
SU(5). [To appear in Proceedings of Fourth International Conference on
Supersymmetry (SUSY96), University of Maryland (May 1996).]
