Danny Williams wearing the NCIS Office of Special Projects Visitor Badge. From the Season 3/Hawaii Five-0 Season 2 crossover episode, "Touch of Death".

The NCIS Office of Special Projects Visitor Badge is a badge that was seen during the Season 3 episode, Episode:Cyber Threat, being worn by NSA Cyber Defence Specialist Patricia Michaels, and Season 3 episode, Episode:Touch of Death, being worn by Hawaii Five-0 Detectives Danny Williams and Chin Ho Kelly.

Apparently, the badge determines that whoever's wearing it must have an escort with them at all times.

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