  In the light of recent experimental data on gaugino searches, we revisit the
direct-transmission model of dynamical supersymmery breaking with the gravitino
mass m_{\tilde{G}}\leq 16 eV, which does not have any cosmological or
astrophysical problems. We find that in the consistent regions of parameter
space, the model predicts not only upper bounds on superparticle masses (1.1
TeV, 320 GeV, 160 GeV, 5 TeV, 1.5 TeV and 700 GeV for gluino, Wino, Bino,
squarks, left-handed sleptons and right-handed sleptons, respectively), but
also a mass of the lightest messenger particle in the range of 10-50 TeV. The
lightest messenger particle can naturally be a messenger sneutrino. Therefore,
this may suggest that the messenger sneutrino could be the dark matter, as
proposed recently by Hooper and March-Russel to account for the gamma-ray
spectrum from the galactic center observed by HESS experiment.
