Overview: Unlike the two world wars and the many before, the conflict in Vietnam was void of a so-called front line. Battles were fought in pockets of resistance, with troops dropped in by helicopter. What did exist was the section of the country dividing the North from the South known as the DMZ (De-Militarized Zone). This was often an arena of heavy combat, and Battlefield Vietnam: War on the DMZ highlights such furious fighting as "Operation Hastings" and "Operation Prairie."