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 can I get morcillas in tampa bay , I will like the argentinian type , but I will to try anothers please?

"Results": [
    {
        "TypeName": "LOC",
        "Text": "tampa bay",
        "Start": 29,
        "End": 38
    }
]

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

Shuttle veteran and longtime NASA executive Fred Gregory is temporarily at the helm of the 18,000-person agency.


"Results": [
    {
        "TypeName": "ORG",
        "Text": "NASA",
        "Start": 29,
        "End": 33
    },
    {
        "TypeName": "PER",
        "Text": "Fred Gregory",
        "Start": 44,
        "End": 56
    }
]