Science Fiction
The year is 2126. It has been 30 years since Iran nuked Washington, DC. Dan "D2" Daniels, a retired army NCO of the old breed, finds a crashed spaceship and learns Earth will soon be invaded. Using the technology from the ship, he assembles an army of ancient veterans to get the job done right.
Live free or Die by John Ringo;
Gray Panthers: Dixie by David Guenther;
Battlefield Earth by L. Ron Hubbard