SpecOps — Craig Alanson

The sequel to 'Columbus Day'. Colonel Joe Bishop made a promise and he's going to keep it; taking the captured alien starship Flying Dutchman back out. He doesn't agree when the UN decides to send almost 70 elite Special Operations troops, hotshot pilots and scientists with him; the mission is a fool's errand he doesn't expect to ever return. At least, this time, the Earth is safe, right? Not so much.