Endgame, Paperback/Dafydd Ab Hugh

They left behind everything that mattered to them-- friends, lovers, country-- to journey to the stars. Now Sergeant Flynn Taggart and Pfc. Arlene Sanders, USMC, have reached their destination... the homeworld of the demon invaders who destroyed Earth. But there, they find a scene of destruction that rivals any they left back on Earth. And suddenly, "Fly" and Arlene find themselves face-to-face with an even deadlier enemy than the demons they came to fight. The war for Earth is over. But the battle for the stars has just begun...