Dawn of the Planet Smasher (Jon "Duke" Shannon Series, #1)

Jon Shannon, callsign "Duke," is a test pilot who earned his skills flying and fighting over Nazi Germany during World War II. A decade later, while living the good life, and working a cutting edge job as an Atomic Age test pilot, Jon, and every able bodied man like him, is summoned to active duty. Because the Planet Smashers have arrived.