from securing or following a substantially gainful occupation ? The opinions provided must specifically reflect consideration of the Veteran ' s military performance evaluations and his post service VA and private treatment records and examination reports . The examiner must explain the rationale for all opinions in detail , citing to supporting clinical data and / or medical literature , as appropriate . 3 . Thereafter , readjudicate the claims , to include entitlement to a TDIU rating . If any benefit sought on appeal remains denied , the Veteran and his attorney should be provided a supplemental statement of the case and afforded an opportunity to respond . The case should be returned to the Board for appellate review . The appellant has the right to submit