Military theorist William S. Lind in Counterpunch updates a paper he wrote with others in 1989 on "Fourth Generation Warfare, or 4GW. America may soon get its share of it, too, it seems:

At its core lies a universal crisis of legitimacy of the state, and that crisis means many countries will evolve Fourth Generation war on their soil. America, with a closed political system (regardless of which party wins, the Establishment remains in power and nothing really changes) and a poisonous ideology of "multiculturalism," is a prime candidate for the home-grown variety of Fourth Generation war -- which is by far the most dangerous kind. Full story