The terrorists later acquire some weaponry by hijacking a shipment destined for Fort A. P. Hill, a training and maneuver center focused on providing realistic joint and combined arms training. Some of the weapons, operating remotely, show up later in the episode.
The original Gatling gun was the subject of a U.S. patent, to a resident of North Carolina. See IPBiz post
Patents, Draft Riots, and Little Big Horn
Also mentioned in the NCIS episode was Tristan da Cunha, which is the most remote inhabited archipelago in the world. One of the ex-NCISers at the meeting had to fly in to Washington from there. Of a "patent" connection, wikipedia notes: On 12 January 1938, by Letters Patent, the islands were declared a dependency of Saint Helena.
***Also, of patents in a prior NCIS episode: