What is a Vietnam Combat Veteran?

It is a veteran who served in the US Military during the time of the Vietnam War without defining the role played within the war itself. It is not saying that they saw combat in Vietnam or that they were even in Asia. Very few who saw actual service in Vietnam would actually use that terminology, preferring something like I was at Dong Ha, or Khe Sahn or Danang. It does not however automatically mean that they did not serve in country.