* It's a typo: Could you double-check the spelling? Perhaps a similar-sounding acronym is intended.
* It's an internal abbreviation: The acronym might be specific to a particular customs agency or training program and not widely known.
* It's not a real abbreviation: The term may be made up or used informally.
To find out what it means, you'll need to provide more context, such as where you encountered this abbreviation.