Defiant — Jack Hunt

The year is 4024. A military space program defends Earth from an alien threat. As Earth expands its borders into the farthest reaches of space, colonizes new worlds and assists civilizations on the brink of destruction, alliances are formed. But not everyone wants peace. When United Earth's Ambassador makes a trip to a war torn zone to assess the crisis and support efforts and arrange the evacuation of allies from a hostile planet, communication is lost. After a distress signal is picked up, Alex Reid, a hard-nosed lieutenant on the brink of retirement is called upon to lead a team into rescue the UE Ambassador and staff. He figures it will be a simple extraction mission with the right team. Only problem, his new team is made up of an insubordinate group of marines who are about to be kicked out of the United Earth Defense Force.