Donald Anderson , also known as Mr. Sigint or simply Sigint , was a former member of FOX and an expert on weapons, equipment, and cutting-edge technology. He was later scouted by Major Zero and requested to join the CIA for his abilities due to having difficulty finding a job anywhere else due to racial discrimination. Anderson was responsible for inventing the Raikov mask , which was originally intended for a CIA-sponsored mission.
An agent was to infiltrate the Soviet Union, impersonate a GRU officer , sneak into a Soviet installation, and steal secret documents. However, the mission was aborted, and Major Zero told Anderson to throw the mask away. However, he was reluctant to do so, as he considered it to be an ingenious design the first mask to "blink" and that it would be an insult to science to throw it away.
Getting the lips to move though, was something he saw beyond anyone's ability. He provided Snake with detailed information on weaponry , machinery, camouflage and gadgetry, having invented, among others things, the active sonar and motion detector that Snake would use during the agent's mission. Johnson along with the "Big Boss" title. He expressed concern when Snake walked away from the room without uttering a word. At some point between , Sigint was also involved in two projects involving making soldiers go through a mission without eating for five days codenamed "Metabolism Dominance" and making soldiers fight without sleeping, as well as various development projects relating to GPS satellites, unmanned aerial vehicles, a human cannon for Special Forces operatives to be launched to the top of a building, and an aircraft resembling a UFO.
Following the success, Sigint greeted Snake with Para-Medic and Zero on an airport runway when the former returned to America , all having been cleared of treason.
Anderson, along with Dr. Anderson was delegated the leader of Cipher after Zero was crippled in a bio-weapon attack by rogue subordinate Skull Face. For a time, however, Skull Face wrested control of Cipher from Anderson, only regaining it after the former's death by the mercenary group Diamond Dogs led by Venom Snake. By early , Anderson had created his brainchild, an AI network that was programmed to maintain the "set of norms" dictated by Zero, and serve as successors otherwise called the Patriots.
