You are referring to the Indochina War period. To this day, the Office issues Viet Minh prisoner cards. You also mentioned Dien Bien Phu, where thousands of French soldiers were taken prisoner in 1954. Many of them were interned in Viet Minh camps. You may be aware of the detention conditions in those camps. A number of post-traumatic stress disorder (PTSD) cases were reported soon afterwards, and some are still being reported today. People still go to the Office to request a former Viet Minh prisoner card for PTSD, and possession of the card comes with a selection of rights.
On September 26th, 2017. See this statement in context.