PRISM Book One: Centerfall:

In 2216, Humanity's golden age of revitalized interest in space travel and colonization had long come to an end due to a rapidly rising insurrectionist movement in the Outer Colonies. At the peak of an all-out war, humanity comes into contact with a greater threat: a mysterious and brutal alien army called the Horde. It falls upon an elite group of augmented super-soldiers to provide the spark of resistance against the overwhelming enemy. Those soldiers are known as the Valkyrie, orphans of...