You just need to take:
- your passport
- your printed biometrics confirmation sheet (with the barcode on it)
They will check your ID and confirmation sheet and stamp the sheet, then take your fingerprints and photo... and then you go home. Shouldn't take more than a few minutes.
You don't need to take the application and documents with you. In some countries you submit
your application and documents, at the same time as giving biometrics, but in the US, you mail everything later (within 5 days of biometrics).
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