" The Physical Evaluation Board is a performance based board and not a continuation of the medical board. At the PEB service members are evaluated against their ability to execute the duties of their rank, rate/MOS, grade, or office. The evaluation of the Unit Commander holds
significant weight with the board. The non-medical assessment (NMA) submitted by the command is the primary document the board leverages to determine the Service member’s ability to perform their duty.
It is imperative that unit commanders take the time to understand and reconcile conditions referred to the PEB for evaluation and provide their own assessment as to why each referred condition prevents the Service member from performing their duty.
If you have specific questions, do not hesitate to contact the customer service section of the PEB at 202-685-6422."
Straight from
https://www.secnav.navy.mil/mra/CORB/Pages/Information-for-Unit-Commanders.aspx