The Board has decided to remand the case due to incomplete service records and the need for a VA examination.

The Board remands the claims for service connection for an acquired psychiatric disorder and memory loss due to a need for additional development, including verification of Reserve service dates, obtaining VistA images, and obtaining an adequate medical opinion.

The Board has remanded the claims for a respiratory disability, sleep apnea, and an acquired psychiatric disorder (claimed as depression) due to potential herbicide exposure in Korea. The Veteran's service records show he was stationed at Camp Casey in Korea from 1980 to 1981. Further development is needed to verify his claimed exposure to Agent Orange.

The Veteran's appeal is being returned to the RO for completion of the development directed by the Board in its last remand. The issues include service connection for an acquired psychiatric disorder, migraine headaches, and hypothyroidism; rating higher than 20 percent for degenerative arthrosis with degenerative disc disease of the lumbar spine prior to May 26, 2017 and to a rating higher than 40 percent thereafter; service connection for radiculopathy of the left lower extremity; an effective date earlier than August 19, 2011, for the grant of service connection for radiculopathy of the left lower extremity; and total disability rating based on individual unemployability (TDIU).

The Veteran's acquired psychiatric disorder (claimed as depression) and bilateral lower extremity radiculopathy are granted service connection, with the Board finding that these conditions are at least as likely as not related to his service-connected back disability. The neck disorder claim is remanded for further examination.