The Veteran is granted a rating of total disability due to individual unemployability based upon service-connected disorders (TDIU) effective from May 24, 2016 until prior to August 14, 2020.

The Board remands the issue of entitlement to a total disability rating based on individual unemployability (TDIU) for referral to the Director, Compensation Service, due to past history of more severe and frequent seizures that could impact employment.

The Board remands the claims for a rating in excess of 10 percent for residuals of a traumatic brain injury, a rating in excess of 20 percent for a left shoulder disability, and entitlement to a total disability rating based on individual unemployability due to service-connected disabilities for further evidentiary development.

The Board granted separate evaluations for a psychiatric disability, the residuals of a traumatic brain injury, and peripheral vestibular disorder, an effective date of April 16, 2020, for the 30 percent evaluation for peripheral vestibular disorder, a TDIU due solely to peripheral vestibular disorder, and SMC under 38 U.S.C. § 1114(s).

The Board denied the Veteran's claims for service connection for an acquired psychiatric disability other than PTSD and for residuals of a traumatic brain injury, finding that there was no evidence to support these claims.