The Veteran's appeal is remanded for additional development, including obtaining medical records and scheduling a VA examination to determine the nature of his foot and ankle conditions. The TDIU claim will also be addressed.

The Veteran's claim for service connection for sinusitis has been denied as there is no persuasive evidence of its occurrence during or shortly after his military service.,The Veteran's appeal seeking an initial compensable rating for headaches was dismissed due to the lack of timely filing and concurrent election issues. The issue will be remanded for further consideration.,The Veteran's claim for service connection for diverticulosis/IBS (formerly GERD) has been dismissed as it is no longer pending at the Board level after a grant by the Board in February 2025, effective from January 23, 2021.,The Veteran's appeal seeking an initial compensable rating for CTS was dismissed due to concurrent election issues. The issue will be remanded for further consideration.,The Veteran's claim for service connection for GERD has been granted by the Board in February 2025, effective from January 23, 2021. The appeal is dismissed as this represents a full grant of the benefit sought on appeal.,The Veteran's claims for bilateral pes planus/plantar fasciitis and CTS were remanded due to concurrent election issues. These issues will be addressed in a future rating decision.,The Veteran's claim for service connection for TBI was not on appeal as it was predecisional error not to address the current rating issue. The issue is remanded for further consideration.,The Veteran's appeal seeking an earlier effective date for the award of a 50 percent rating for migraine headaches will be considered in a future decision.

The Board has found that additional development is necessary for the Veteran's claims of entitlement to increased ratings and service connection for bilateral shin splints, bilateral pes planus/plantar fasciitis, and right foot hallux valgus. The case will be returned to the Board after completion of the requested actions.

The Veteran's bilateral knee degenerative joint disease was granted service connection. The issues of service connection for bilateral pes planus/plantar fasciitis and right foot hallux valgus are remanded, as well as the rating for service-connected bilateral shin splints.

The Board denied an increased rating for bilateral pes planus/plantar fasciitis and a TDIU claim. The Veteran's service-connected disabilities do not preclude substantially gainful employment.