The Board has determined that the veteran's cervical spine degenerative disc disease is attributable to service. The claims for fatigue and memory loss are granted as they may be due to undiagnosed illnesses incurred during Persian Gulf service.

The Board denied the Veteran's claims for service connection for tinnitus, arthritis, and memory loss. The decision found no evidence linking these conditions to his military service.

The Veteran's depression was rated at 50 percent prior to July 1, 2016. The Board found that the evidence did not support a higher rating due to occupational and social impairment with reduced reliability and productivity. For TDIU, the Veteran had multiple service-connected disabilities but his education and work experience were sufficient for sedentary or light labor employment.

The Board has determined that the AOJ did not obtain all necessary opinions regarding whether the Veteran's symptoms are related to an undiagnosed illness or medically unexplained chronic multisymptom illness (MUCMI). The claims for service connection for fatigue, fibromyalgia, left elbow disorder, right elbow disorder, and sleep disorder are remanded for further development.

The Veteran's claim for service connection for migraine headaches, as secondary to tinnitus, is granted. The claims for service connection for hearing loss disability and a disability manifested by shortness of breath other than chronic sinusitis and allergic rhinitis are denied. The claims for service connection for an intestinal disability (diverticulitis), fatigue, hypertension, neck disability, right upper extremity radiculopathy, left upper extremity radiculopathy, right shoulder disability, left shoulder disability, upper and lower back disability, right lower extremity radiculopathy, left lower extremity radiculopathy, right hip disability, left hip disability, right foot pain, left foot pain, gastroesophageal reflux disease (GERD), and an acquired psychiatric disorder are all denied.