The appeal for entitlement to service connection for a sinus disorder is remanded.

Board reasoning

The Board remands to complete development, citing repeated remand history and incomplete VA records, and requests an ENT clinician to assess etiology in light of in-service accidents and post-service findings. The Board emphasizes the need to address lay statements and earlier treatment records (e.g., February 1980 deviated septum and early sinusitis) in forming a new opinion responsive to remand directives.