Initially, an applicant for benefits must prove that he or she is a “veteran” so a copy of the DD-214 should be included when a claim is filed.  Medical evidence to document a current diagnosis as well as course of treatment since discharge for the claimed condition is also required.  The veteran’s Military Personnel Record and Service Treatment Records should be obtained and submitted with a claim for benefits to support the event of injury or illness or aggravation of a pre-existing condition while serving in the military.  A medical opinion from a doctor confirming that the current medical condition is related to military service (known as a “nexus” opinion) should be part of the claim packet.  A “buddy statement” could also prove helpful as it might help document an event in service, a change to an individual following service, or a current medical condition and its effects on the veteran’s ability to function.