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The ten dimensional string theories as well as eleven dimensionalsupergravity are conjectured to arise as limits of a more basic theory,traditionaly dubbed M--theory. This notion is confined to the ten dimensionalsupersymmetric theories. String theory, however, also contains ten dimensionalnonsupersymmetric theories that have not been incorporated into this picture.In this note we explore the possibility of generating the low energy spectra ofvarious nonsupersymmetric heterotic string vacua form the Horava--Witten model.We argue that this can be achieved by imposing on the Horava--Witten model aninvariance with respect to some extra operators which identify the orbifoldfixed planes in a nontrivial way, and demonstrate it for the E_8 andSO(16)XSO(16) heterotic string vacua in ten dimensions.

On the Low Energy Spectra of the Nonsupersymmetric Heterotic String Theories