  The TeV gamma-ray source MGRO J1908+06 is one of the highest-energy sources
known, with observed emission by the High Altitude Water Cherenkov (HAWC)
Observatory extending well past 100 TeV. The source exhibits both
energy-dependent morphology and a spatially-dependent spectral index. The
emission is likely to be dominantly leptonic, and associated with the
radio-quiet PSR J1907+0602. However, one-population models do not describe the
data well; a second particle population is needed to explain the shape of the
spectral energy distribution at the highest energies. This component can be
well-described by either leptonic or hadronic hypotheses. We discuss this
feature and implications for detection by multi-wavelength and multi-messenger
experiments.
