undebatable ) that the acquired psychiatric disorder that was present during service existed prior to active military service ? If it is determined that a psychiatric disorder did not exist prior to service , the examiner should reconcile such finding with the December 2012 VA examination report , which includes the finding that the Veteran ' s depression predated service . ( d ) If the acquired psychiatric disorder existed prior to active military service , is it also clear and unmistakable ( obvious , manifest , or undebatable ) that such disorder was not aggravated during or by his active military service beyond the condition ' s natural progression ? Any clear and unmistakable ( obvious , manifest , or undebatable ) evidence which serves as the