  We investigate the phenomenology of an orbifold string model in which
supersymmetry breaking is dominated by the overall `size' modulus field and all
matter fields are in the untwisted sector. The possibly close degeneracy of the
lightest neutralino and chargino and the possibly small splitting between the
gluino and chargino/LSP mass imply that discovery of supersymmetry at future
colliders could be more challenging than anticipated. Specialized search
strategies and particular detector features could play an important role. For
preferred model parameter choices, the phenomenology of dark matter in the
universe is significantly modified.
