The investigators postulate that 1) GOALS training will improve neurocognitive function in attention and executive function domains, complex functional task performance, and emotional regulation in Veterans with chronic mTBI; 2) improved neurocognitive function will be correlated with macrostructural, microstructural and functional changes in the corresponding brain networks on high field (3T) and ultra-high field (7T) structural MR imaging, diffusion tensor imaging (DTI) and resting state fMRI performed pre- and post-training; 3) Changes in both behavioral function and imaging measures will be maintained at 6 months post-training and be associated with improvements in activities and participation.