Another novel, Cally's War (and its two sequels), takes up the story a few decades later; The Hero is set nearly a thousand years later.
With the Earth in the path of the rapacious Posleen, the peaceful and friendly races of the Galactic Federation offer their resources to help the backward Terrans—for a price.
We could send our forces to fight and die (as only humans can) against a ravening horde that was literally feeding on its interstellar conquests, or remain as we were: virtually weaponless and third in line for brunch.
[1] After five years of battling invaders, human civilization prepares a strike to drive the aliens from the Earth.
When he squares off against Major Michael O'Neal, the only winner will be Satan himself...[1] With the defenses of the Southern Appalachians sundered, the only thing standing between the ravening Posleen hordes and the soft interior of the Cumberland Plateau are the veterans of the 555th Mobile Infantry.
[1] According to John Ringo's website, two more books in the series are planned, titled Beneath the Avalanche (2015) and Master of the Winds (2020).
The "Greens" and the "Reds" (nicknames for the German political parties Alliance 90/The Greens and the Social Democratic Party of Germany) organize riots and protests; the re-integration of the SS officers and the choice of the Parliament and Chancellor to give to those officers control of the training of the young men of Germany.