Entitlement to service connection for sleep apnea is remanded.

Board reasoning

The Board notes the Veteran has obstructive sleep apnea and that VA failed to provide a VA examination or medical opinion addressing nexus. The Board determines there is a duty to assist triggered by the diagnosis and the combat service exposure, and notes the lack of an examination hindered a decision on the claim. Upon remand, the examiner must assess whether the sleep apnea is at least as likely as not related to active duty, including environmental exposures and service conditions, with a full rationale.