Donald Anderson

Sigint is a member of FOX and the self-proclaimed "expert on weapons and technology".

Sigint provides detailed information on weaponry, machinery, camouflage, and gadgetry. He, among others things, invented the binoculars Snake uses during Operation: Snake Eater. He provides useful strategies and tactics in boss battles and other situations. His codename refers to the military term "SIGINT", or SIGnal INTelligence. In 1965 Sigint joined ARPA and takes part in the development of ARPAnet. Many years later as it (apparently) turns out Sigint would become the DARPA Chief of ARPAnet (apparently the D was an add on as his name is Donald Anderson). Ocelot would eventually kill him ("accidentally" as he would tell Liquid) during touture as he was the only one who knew his true identity as either an agent under Solidus or even the Patriots (though the former is more likely).

A funny conversation occurs when Snake is wearing a box. See Metal Gear Solid 3 Conversations for a full list of comical conversations.

Equipment
Binoculars

An optical device useful for viewing guards at a distance.The most notable feature is that the eyepeices are partially covered to prevent sunlight glinting off them and giving away Snakes position to enemy guards.

EZ-Gun

is a tranquilizer gun with a built-in suppressor and unlimited ammo.