A federal judge has given the go-ahead to a lawsuit by a veteran from Connecticut who wants the military to upgrade his “bad conduct” discharge, claiming his actions were caused by post-traumatic stress disorder.

The Army had attempted have the case of William Dolphin, a disabled Vietnam combat veteran and Purple Heart recipient, thrown out of court. But in a 10-page ruling, U.S. District Senior Judge Warren Eginton ruled that Dolphin, who is being represented by Yale Law School students, could proceed with his challenge to the Army’s refusal to consider his application for a discharge upgrade.