(2008).

In this matter, the medical evidence of record shows that the currently diagnosed diabetes mellitus did not manifest during the Veteran's military service.  In the October 2014 and December 2014 reports, the VA examiner reviewed the Veteran's medical history, and concluded that the Veteran's diabetes mellitus, type II, did not initially manifest during the Veteran's military service.  Accordingly, the Board finds the October 2014 and December 2014 VA medical opinions are probative as to the question of etiology, as they appear to have been based upon a thorough review of the record and provided detailed rationale based upon the Veteran's entire history.  See Bloom v. West, 12 Vet. App. 185, 187 (1999) (the probative value of a physician's statement is dependent, in part, upon theextent to which it reflects "clinical data or other rationale to support his opinion").  Crucially, the VA examiner concluded that the Veteran's currently diagnosed diabetes mellitus, type II, did not manifest in service and was, in fact, unrelated to the Veteran's military service.  His conclusions were rendered based upon review of the entire claims file and discussion of the clinical record.  In addition, the rationale set forth in the October 2014 and December 2014 medical opinions was substantial, thorough, and based on the overall record.

Moreover, the Veteran has not produced a medical opinion to contradict the conclusions of the VA examiner set forth in the October 2014 examination report and the December 2014 medical opinion.  As was explained previously herein, the Veteran has been