Under 38 CFR 3.306, what must be proven regarding a pre-existing condition claimed for aggravation?

To establish the aggravation of a pre-existing condition under 38 CFR 3.306, it must be demonstrated that the increase in disability occurred during military service. This means that if a veteran had a condition prior to their service, they must show that their military experiences exacerbated or worsened that condition while they were on active duty. This standard is in place to ensure that veterans receive compensation for disabilities that were not just worsened by service but specifically aggravated by the circumstances of their military experiences.

In the context of this regulation, the focus is on the evidence that highlights the connection between service and the worsening of the pre-existing condition, clarifying that the service-related aspect is essential to the claim of aggravation. Establishing this link is crucial for the veteran to receive benefits for any additional disability resulting from their time in service.