The National Security Agency (NSA) is a national-level intelligence agency of the United States Department of Defense. The NSA is responsible for global monitoring, collection, and processing of information and data for foreign intelligence and counterintelligence purposes, specializing in a discipline known as signals intelligence (SIGINT). The NSA is also tasked with the protection of U.S. communications networks and information systems. The NSA relies on a variety of measures to accomplish its mission, the majority of which are clandestine.
Giacinta "Jinx" Johnson is an agent of the NSA. Her performing physical espionage operations is extremely unusual for a NSA employee. She must therefore belong to a unconventional black ops unit of the National Security Agency.
Given her expertise in the field, it is also possible that agent Mya Starling belongs to the same NSA unit as Jinx.