, " and hence will not affect " the essential fairness of the [ adjudication ] " for the service connection claim at issue . See ATD Corp . v . Lydall , Inc . , 159 F . 3 d 534 , 549 ( Fed . Cir . 1998 ) ; Mayfield v . Nicholson , 19 Vet . App . 103 ( 2005 ) . II . Analysis The Veteran asserts that service connection for chronic PTSD or other psychiatric disorder is warranted as she has been diagnosed with chronic PTSD secondary to several stressful events , which occurred during her periods of active duty and active duty for training with the Army National Guard . In her November 2007 claim , the Veteran advanced that