The Board has denied service connection for the Veteran's claimed right lower extremity neuropathy, left lower extremity neuropathy, right upper extremity neuropathy, and left upper extremity neuropathy as they are not related to his military service or herbicide agent exposure. The claim for neck and throat cancer was also denied as it is not presumed to be due to herbicide agent exposure.

The Veteran's TBI and other specified trauma disorder are being remanded for further evaluation.,The Veteran's increased rating claim for other specified trauma disorder is also being remanded.,Service connection for ulcerative pancolitis, irritable bowel syndrome, chronic anemia, skin disability (psoriasis), sleep apnea, cervical spine disability, right knee disability, left hip disability, and right lower extremity neuropathy are all being remanded due to the need for additional medical examination and opinion.,The Veteran's service connection claims will be addressed based on his credible history of service in combat zones.

The appeal is dismissed as the Veteran's request for a Higher-Level Review (HLR) of a March 2023 HLR rating decision was untimely and invalid. The claims for increased ratings for bilateral lower extremity neuropathy are denied.

The Board has remanded the Veteran's claims for special monthly compensation based on housebound status and need for regular aid and attendance due to the combined effects of his service-connected disabilities. The evidence does not meet the criteria for SMC at the housebound rate.

The Board has determined that the Veteran's claims for increased ratings for his service-connected right and left lower extremity neuropathy require additional development due to missing medical evidence, specifically an EMG from June 2023. The VA examinations also did not consider the ameliorative effects of medication on the severity of the disability.