Please identify all the named entities mentioned in the input sentence provided below. Use only the categories: PER - person, ORG - organization, and LOC - location.
Remember, nationalities are neither locations nor organizations, and organizations can represent other groups of people.
Pay attention to the provided example. You should only output the results in JSON format, following a similar structure to the example result provided.

Example sentence and results:

Where in the world is Iguazu?

"Results": [
    {
        "TypeName": "LOC",
        "Text": "Iguazu",
        "Start": 22,
        "End": 28
    }
]

Considering the input sentence below, what is the output result?

However, what they hoped to do during the Tet Offensive was to sneak past the Americans and attack the ARVN in the urban areas where they were deployed doing successful Clear and Defend operations.


"Results": [
    {
        "TypeName": "ORG",
        "Text": "ARVN",
        "Start": 103,
        "End": 107
    }
]