This is a single-arm, single-stage Phase II study designed to evaluate the 1-year PFS rate in subjects with locally-advanced NSCLC (stage II/III) and treated with Stereotactic Body Radiation Therapy (SBRT) followed by concurrent mediastinal chemoradiation with or without consolidation chemotherapy. A total of 56 subjects will be enrolled to this study over a 3 year accrual period.