The Defense Advanced Research Projects Agency (DARPA) was an agency of the United States Department of Defense responsible for the development of new technology for use by the military. DARPA was responsible for funding development of many technologies which have had a major impact on the world, including computer networking (starting with the ARPANET, which eventually grew into the Internet), as well as NLS, which was both the first hypertext system, and an important precursor to the contemporary ubiquitous graphical user interface.
"Cobra" was the alias of a DARPA scientist who was involved in creating a cure for all human disease using alien technology. After he gave the data to Dana Scully, the Cigarette Smoking Man had him shot. ("En Ami")