SpecOps: Expeditionary Force, Book 2 / Craig Alanson

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 from. At least this time, the Earth is safe, right?

Not so much.