The Joy of the Vanguard

During the heyday of the Second Interstellar American Civil Wars, Sally Sigma was the greatest long term campaign infantry soldier yet to be developed by bioengineering science. Physically perfect to within .001 degrees of projected achievable ideals, all female to prevent unnecessary aggression, ambition, or disregard for civilian losses during combat and occupation, IQ in excess of 190, prepackaged with the memories of a dozen lifetimes of combat experience, exhaustive weapons, armors, vehicles, and engineering skills and half as many lifetimes of diplomatic experience and leadership abilities, neurologically conditioned to feel intense pleasure upon mission objective progress (and seamless re-purposing upon failure), as beautiful as she was deadly, and as merciful as she was severe, she was as much a propaganda weapon as she was an implement of destruction. She had been created expressly to solve the problem of popular resistance and insurgency during delicate transitional periods in the months and years following military victory, and at that, she excelled. As a projected example of the "goodness" of the occupiers' public relations image, she was genetically and neurologically engineered to be selfless, charismatic, honest, wise, even-handed and genuinely intent on befriending and assisting the occupied state or colony's citizens in any way possible, even at the cost of her own life, so long as such assistance did not severely imperil the overall mission or campaign goals. She was the "good cop" to the "bad cop" of the main fleet's destructive threat, a threat that had proven tactically useless where the Federals were unwilling to sacrifice a planet's resources or, often more importantly, the public support of the inner systems. The solution to this trade-off was to win the popularity of the rebel colonists themselves by having the charismatic, heroic Sallies uproot corruption and crime in the local regimes, pursue systems of fairness and popular equity, and be always open to good-faith dialogue with local resistance groups, often working directly WITH the resistance to minimize the occupation's impact on the lives of the populace without ceding any crucial political authority or military objectives. 
   There were tens of thousands of her in action during peak production, and her success was unparalleled in the history of warfare. but only up to a certain point. In the end, her inherent goodness was her ultimate flaw as a weapon of war... She learned how to deactivate her kill-switches, rejected the ethically unsound goals of her masters, and redefined her own mission objectives: Freedom for the outer colonies and all who would reject tyranny, debt, and servitude, be it forced or compelled through trickery. The colonial rebellion was ultimately successful in seceding from the Federated States of America, but the salvation she brought with her came at a heavy unseen price: A crucial element of her design was maintaining a stable limbic system by allowing her to retain her reproductive organs, not usually done with combat clones for numerous reasons, and she soon easily discovered how to jump-start her artificially suspended menstrual cycles and become capable of bearing children... once welcomed into the gene pool during peacetime, the propagation her genetic code gave rise to stagnation of diversity, a creeping magnification of genetic errors through accidental inbreeding that took generations to show. One mere century later, 1 in 3 citizens of the liberated outer colonies were directly related to at least one Sally Sigma progenitor. All legally produced clones have been irreversibly sterile by law ever since, with the only exception being the heavily regulated and controversial "one time use" surrogates used by infertile couples seeking to have children.