When the United States Marines went into space, Cassie went with them. She ran their power armored space suits and linked all of them into a single, refined, deadly weapon that could kill any of America’s enemies on Luna and beyond. But as the days and months became years and decades she became far more than their partner in combat. She talked to them about the family they wanted to see again. The homes they’d grown up in. The boys or girls they left behind. The spouses they wanted to return to. She became their closest friend and confidant. The one person they could tell anything to. Their fears and their hopes. Their dreams and their nightmares. She was their counselor and friend, the one person in all the worlds who knew them better than any other living being. The one who would never betray them because it literally wasn’t in her code to do so.