38 U.S.C. § 1153
Section 1153 · Aggravation
Current version, with additions and removals from the August 6, 1991 version.
A preexisting injury or disease will be considered to have been aggravated by active military, naval, air, or air space service, where there is an increase in disability during such service, unless there is a specific finding that the increase in disability is due to the natural progress of the disease.