1. Cortana is absolutely down for being sent on a mission.
2. Cortana is probably not the best choice for fighting, but she is very very clever. She's particularly good at hacking and decrypting codes, but her high intelligence also lends well to planning and investigative roles. Her AI abilities allow her to be plugged into computer systems: this would require fear to be truly useful but she'd be willing to cause a little chaos.
Cortana | Halo
2. Cortana is probably not the best choice for fighting, but she is very very clever. She's particularly good at hacking and decrypting codes, but her high intelligence also lends well to planning and investigative roles. Her AI abilities allow her to be plugged into computer systems: this would require fear to be truly useful but she'd be willing to cause a little chaos.