What would happen if you flew the flag of South Vietnam in Modern day Vietnam?

"Results": [
    {
        "TypeName": "LOC",
        "Text": "South Vietnam",
        "Start": 42,
        "End": 55
    },
    {
        "TypeName": "LOC",
        "Text": "Vietnam",
        "Start": 48,
        "End": 55
    }
]