OFI79T4 vs NAC?

I looked someone up in DISS / SII Search. He had an OFI79T4 from DHS ‘Received’ on 2/28/23 and a NAC from OPM close on 3/10/23. These were both from the same initiated BI. Can anyone tell me what a OFI79T4 is and how it differs from a NAC?

Thank you.

Form OFI-79 simply means a Tier 4 Public Trust investigation was submitted. DHS runs their own investigations which is why it is recorded differently. A NAC is fingerprint submission for a National Agency Check is rolled into as a part of a tiered investigation.

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