Right now that seems to be the US, EU, and IAEA.

"Results": [
    {
        "TypeName": "LOC",
        "Text": "US",
        "Start": 31,
        "End": 33
    },
    {
        "TypeName": "ORG",
        "Text": "EU",
        "Start": 35,
        "End": 37
    },
    {
        "TypeName": "ORG",
        "Text": "IAEA",
        "Start": 43,
        "End": 47
    }
]