The Dark Victory Series

Sixteen-year-old Randy Knox has the usual problems of a teenage boy: getting along with his father, dating his sweetheart, and trying not to fail his junior year of high school. But Randy also has other demands on his time, as a sergeant in the NH National Guard, attached to the US Army, and fighting the invading Creepers. But now change has drastically come to his life. The current President of the United States has announced that scattered remnants of the Air Force have destroyed the Creeper's Orbital Base, ensuring victory over the alien invaders. 

US Army Sergeant Randy Knox is 16 and already a seasoned veteran. He is an alien-killing prodigy who has eradicated more of the invading Creepers than anyone can keep track of. But Randy is also a high school student struggling with geometry. As Randy's hodge-podge military unit makes a desperate stand at a remote outpost, young Sergeant Randy Knox learns just how far he will go to protect those he loves-and what it takes to save humanity from total alien domination.

More than 10 years ago, the alien Creepers arrived in Earth's orbit and started a war that was a slaughter for humanity. Nuclear weapons detonated in the atmosphere destroyed all electronic devices, asteroids dropped into oceans and lakes swamped cities with artificial tsunamis, and the nearly invulnerable Creepers arrived on Earth, going forth from their dome bases to attack civilians and military units at will. Sixteen-year-old Randy Knox, a newly minted lieutenant in the US Army, has been fighting the Creepers since he was 12.