Sigint (real name: Donald Anderson) is a member of the FOX unit, and the self-proclaimed "expert on weapons, equipment and cutting-edge technology", although his self-credibility would precede him as an arms specialist and engineer. He provides detailed information on weaponry, machinery and camouflage techniques, as well as gadgetry to Snake during Operation: Snake Eater. His codename refers to the military term "SIGINT", or signals intelligence.Sigint is the youngest member of the team, being only 24, and believes himself to be the only sane member of the unit. Sigint tends to become easily irate, criticizing Snake on various occasions for his strange and conspicuous choices in clothing and face paint (one memorable example being when he questions Snake on his use of a cardboard box for a disguise). He is also the character most responsible for breaking the "fourth wall", as well as attempting to explain away things that seem odd or not right. For example, playing the game a second time with The Boss' Patriot pistol will result in Sigint asking Snake how he managed to get his hands on the gun if The Boss is still alive and using the weapon herself. Snake will reply that Sigint worries too much about "the details."
He developed the Active Sonar, the Motion Detector, the AP. Sensor, and the EZ Gun (available only on the Very Easy difficulty setting or getting it by catching all 47 edible items and species of animals and plants in the game in any other difficulty) which Snake uses, as well as the Raikov mask (a reference to the main character of Metal Gear Solid 2: Sons of Liberty). In 1965, Sigint joined DARPA and takes part in the development of ARPANET. In a radio conversation, he reveals to Snake that he suffered racial discrimination in his former jobs, because he is black, and that Major Zero recruited him without any prejudices.
