The Veteran's claims for service connection for various conditions, including brain disease, joint pain, muscle pain, blurred vision, fatigue, peripheral neuropathy/fibromyalgia, insomnia, memory loss, and an acquired psychiatric disorder (PTSD and schizophrenia), are denied as there is no evidence of a current disability that was incurred in or due to his time in service.

The Board has remanded the case due to an inadequate opinion regarding the relationship between any current acquired psychiatric disorder and service, specifically a claimed in-service personal assault. The Veteran's contentions are that he did not report or seek treatment for this assault because he feared it would complicate his discharge.

The Veteran's claim for a separate disability rating for insomnia is denied as it is subsumed under his service-connected PTSD.,The effective date for the grant of service connection for PTSD is denied as no new and material evidence was submitted within one year of the July 1986 denial, making the June 9, 2017, claim without legal merit.,The effective date for the grant of service connection for OSA is denied as no new and material evidence was submitted within one year of the April 2013 denial, making the June 9, 2017, claim without legal merit.

The Board has determined that remand is required for several issues, including service connection for stroke and memory loss, as well as an increased rating for PTSD. The AOJ must verify the Veteran's claimed in-service exposures, obtain all relevant treatment records, and provide a medical nexus opinion regarding the nature of his disabilities.

The Veteran's service connection claim for insomnia is granted as the evidence supports a finding that his current insomnia began during and has continued since service, and was at least as likely as not caused by service.