Looking for military records for my 1st cousin Robert J Filipowski

Robert J Filipowski served in Vietnam. Not sure exactly how many tours. Probably more than three less than six. He was awarded the Disgusting Flying Cross. I believe that was Feb 1971.

He also was awarded a Purple Heart. i tend to think that was the same incident. He received a couple of other

How can I find basic information on his service. He was Army and a helicopter pilot.