Sandy is the main character of Earth Chapter. Because she is the daughter of Dr. Grey Newman, the discoverer of the ruins on the Moon, she feels a certain degree of responsibility for the destruction wrought by the MME. A gentle woman by nature, the stuggle for survival has hardened her. Rather than give in to cynicism as so many have, Sandy retains her idealism. She fights with firm resolve and by the beginning of the story has risen to the level of a minor officer in the resistance movement. Is is she who forces the leader of the MME to face the truth it cannot bear to see at the climax of the story.

The Solnoid race is long dead, annihilated along with their enemies in the final battle at Sigma Narse. But their descendants survive on Earth, and have now inherited the sad destiny predicted so many years before. 
The year is 2085. 
The third world war between East and West has reduced the cities of Earth to mountains of rubble. The mechanical killing machines created by both sides now ruthlessly hunt down the remnants of humanity. Old hatreds between human factions prevent an effective resistance, and the only hope for survival rests in a desperate plan: evacuate the survivors to Mars Base. There they can rebuild and plan the liberation of the home world. 
Among them, one young woman carries the guilt of her father`s hand in the destruction of civilization. Unknown to her, she also carries the key to a possible salvation. As destiny draws new friends and allies to her, a new Gall Force is born to rise up against the coming destruction... 
(Source: AniDB)

The year 2085 and the only winners of the last war were the machines. Years previously the human race discovered the ruins of an ancient ship beneath the moon's surface and used the knowledge gained to create weapons of war. Eventually these weapons turned against mankind, seeing them as a threat and deciding the only way to stop these war loving humans was to destroy them. Heavily influenced by the 1984 Terminator movie, this new series focuses upon Sandy Newman as she leads a band of warriors in an attempt to reclaim the earth from the machines. If they can reach a group of unlaunched nuclear missiles, they can take out the machine`s headquarters located in Australia. 
(Source: AniDB)