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?

When the Americans swept in with their Search and Destroy operations the Communists quickly leaned they could not stand up to the US firepower, and these regular troops were forced to flee the country and take sanctuary across the borders in Laos and Cambodia.


"Results": [
    {
        "TypeName": "LOC",
        "Text": "US",
        "Start": 130,
        "End": 132
    },
    {
        "TypeName": "LOC",
        "Text": "Laos",
        "Start": 242,
        "End": 246
    },
    {
        "TypeName": "LOC",
        "Text": "Cambodia",
        "Start": 251,
        "End": 259
    }
]