halo 3 question!?

Cortana is one of thousands of AIs which populate the computer networks of the Human worlds. She is, however, somewhat unique; she is a direct copy of a human being, Dr. Halsey, and lacks behavioral inhibitors of any kind. She is free to do as she pleases, unlike most other military AIs, such as the ONI AI Beowulf, which is strict, sullen, and by-the-book. Cortana, on the other hand, is strong-headed, noisy, and somewhat off-the-wall.

However, her freedom comes at a price. As a "smart" AI, she has an unextendable life-span of approximately 7 years, at which time she will become too smart, suffering from an exponential attenuation of function; she will think so much she will forget to breathe.

At her choosing, she and the Master Chief were specifically paired together for Mjolnir/Spartan II proving trials, in preperation for her placement aboard the Pillar of Autumn for its covert infiltration mission (which was cut short by the Covenant invasion of Reach). In the midst of the Pillar of Autumn's fiery descent to Halo, her safety (as well as that of the UNSC and coordinate data she possessed) could be assured in only one place- the suit of the Master Chief.

shes cortana, a virtual guide to master chief; in halo 3 the chief must rescue her; she lives in a chip placed in master chief's helmet

cortanas a stupid btch