The Board has determined that the veteran's varicose veins of the right leg are due to disease or injury incurred in service, and his duodenal ulcer residuals are due to a disease that was incurred during service. The Board denied service connection for left leg varicose veins.

The Veteran's service connection claims for coronary artery disease, atherosclerosis, peripheral vascular disease, varicose veins, and irritable bowel syndrome are remanded due to the need for additional medical opinions regarding secondary service connection.

The Veteran's service connection claims for various conditions, including adjustment disorder, benign skin lesions, actinic keratosis, poikiloderma, porokeratosis, Parkinson's disease, benign prostatic hypertrophy, hypertension, increased urinary frequency, diverticulosis, duodenal ulcer, and bilateral cataracts are all granted due to exposure to herbicide agents, mustard gas, and ionizing radiation during service.

The Board has remanded the case due to inextricably intertwined issues of service connection for chronic venous insufficiency and an increased rating for varicose veins. The AOJ must adjudicate both claims, request an addendum opinion from a VA examiner, and readjudicate the issue in light of all evidence.

The Board has remanded the case due to errors in duty to assist and insufficient examination, as well as new evidence from the PACT Act. The Veteran's current DVT may be related to a motor vehicle accident during service, and there is no direct evidence of its cause. A VA examination will be conducted to address these issues.