Carol Rawley
From Halopedia, the Halo wiki
Flight Officer Captain Carol Rawley (alternatively known by her Call Sign Foehammer) is the pilot of Pelican transport Echo 419 on the Pillar of Autumn in 2552. She has great talent in the way of hostile insertions and mounting rescues, and this makes her stand out among the other pilots on the Autumn. Foe Hammer is voiced by Tanya Pettiford-Wates. Her copilot is Lieutenant Frye. She is technically an unseen character, as players can only see her ship. She is a member of the 23rd Naval Air Squadron.
Not long after the Pillar of Autumn makes a blind jump to Threshold, Covenant forces descend once again upon the ship. Foehammer escapes in the ensuing battle, and descends to the surface of Installation 04, where many UNSC forces have landed. There, she helps the Master Chief and Cortana pick up scattered Marines and get them out of the battlefield. She is tragically shot down later by Covenant Banshees, as she attempts to pick up the Chief one last time and escape Halo as the Pillar of Autumn explodes and destroys Halo.
In addition, Foehammer is one of the few female characters of note in Halo. She, Cortana, the pilot of Keyes' Pelican in the flood complex raid, and the pilot of Master Chief's escape pod are the only females in the original video game. The second game features two female marines, voiced by Michelle Rodriguez: Laura Prepon and Julie Benz. The series of books provides a wider view of the soldiers, several of whom are female.
Trivia
The call sign "Foehammer" comes from the fourteenth level of Marathon Infinity. "Foehammer" is also a literal translation of the name of Gandalf's sword, Glamdring as well as the name of the dragon slaying arrow in Stephen King's book The Eyes of the Dragon.
Foehammer's Pelican, Echo 419, is possibly another reference to the number ' 7.' 4 + 1 + 9 = 14 = 2 * 7