b ) ; see also Dizoglio v . Brown , 9 Vet . App . 163 , 164 ( 1996 ) . If , however , the Veteran ' s stressor is unrelated to participation in combat , then lay testimony , in and of itself , is insufficient to corroborate the stressor . The record must contain credible supporting information from an independent source that corroborates his testimony or statements , such as service records . See Cohen , 10 Vet . App . at 146 - 47 ; see also Moreau v . Brown , 9 Vet . App . 389 , 394 - 95 ( 1996 ) . Apart from the above provisions , VA revised the regulation governing adjudication of claims for service connection