From Halopedia, the Halo wiki
During the Human-Covenant War, Speakman served with the UNSC Army and led a dozen engagements during the Covenant's siege among the Inner Colonies. Following the end of the war, she served as an Army representative for the Office of Naval Intelligence during urgent meetings and conferences.
In 2555, Speakman convened with several high-ranking UNSC members and scientists at HIGHCOM Facility Bravo-6 after it was discovered that the active installations of the Halo Array were counting down to fire in several weeks. The group decided to send a joint UNSC-Sangheili task force to Installation 00 to end the activation sequence; the task force ultimately succeeded.
Personality and traits
A brilliant and formidable strategist, Crystal Speakman is an aggressive warrior and was recognized as a bitter foe of the Covenant during the Human-Covenant War. As a result of her aggression, Admiral Serin Osman of the Office of Naval Intelligence considers Speakman to be someone that she can easily peg and leverage if needed. Due to Speakman's hate towards the Covenant, she was considered to be the polar opposite to UNSC Marine Corps General Van Zandt, who believed peace could be achieved with the Covenant during the war.
List of appearances