Hungarians in Vietnam

Fifty years ago, on January 27, 1973, a Hungarian delegation of soldiers and diplomats set off for South Vietnam. It is characteristic of their unpreparedness that they arrived in Saigon in 40-degree heat wearing overcoats, where they were not welcomed anyway. Over the course of two and a half years, 636 Hungarians served in the International Control and Supervision Commission, whose basic task was to check which side in the divided country was violating the ceasefire. Why was this mission impossible?