Retaliation by Martin Wallace

Newly re-edited

When Earth is invaded by creatures from another world, the fallout leaves a world dead from nuclear fallout, human survivors flee to space for survival looking for haven to re-group, re-arm and retaliate against their aggressors. These surviving humans call themselves the Earth Reclamation Force (ERF), a militarized space force working hard to survive and gain any advantage over their enemy. The story predominately follows SC a Lt Commander in the ERF and the head of their most notable fighter detachment. SC fights for his cause and is resourceful in his pursuits but can sometimes be a little free and easy with the rules.