When the evidence clearly establishes an exact onset date, enter that date.
               When the evidence does not establish an exact onset date, but establishes disability
                  before the end of the RP, and a more precise date is not material, enter the first
                  day of the earliest month and year that the evidence of record can establish the individual
                  as disabled.
               
               When the medical evidence is inconclusive as to an exact onset date but clearly show
                  disability commenced at least:
               
               
                  - 
                     
                        a.  
                           Twelve months for a CDB-D claim (based upon NH disability entitlement) prior to the
                              month in the filing date; or
                            
 
 
- 
                     
                        b.  
                           Six months for a CDB-R claim (based upon NH retirement entitlement) prior to the month
                              in the filing date; and
                            
 
 
- 
                     
                        c.  
                           Within the RP; then 
                              - 
                                 
                                    • 
                                       Establish onset on the first day of the 12th month before the month in the filing
                                          date (for a CDB-D claim) or
                                        
 
 
- 
                                 
                                    • 
                                       Establish onset on the first day of the 6th month (for a CDB-R claim) before the month
                                          in the filing date, to permit full retroactivity of benefits.