Expeditionary Force

The Expeditionary Force is a sprawling science-fiction saga that blends military sci-fi, space opera, and irreverent humor into a fast-paced, character-driven adventure. Centered on U.S. Army Sergeant Joe Bishop and his unlikely partnership with an all-powerful, arrogant artificial intelligence nicknamed Skippy the Magnificent, the series takes readers from a sudden alien invasion of Earth into the depths of interstellar politics and warfare. While it is corny at times, and there's definitely some deus ex machina going on, the 19 Books, short novel Trouble on Paradise, the Audio Only Homefront and the two books in the Mavericks Series create an absolutely gripping story for which I drop everything to listen to the next installment when it releases. The Audio book series spoken by R.C. Bray is just masterfully done as well. @Anuril