Yepper..
Starts with surprise attack on amerika ( a liberal, PC america )
The main character is ex-military expert turned writer, and manages to survive what appears to be a combo chemical / biological attack that paralyzes the country.
The real "stretch" is the science fiction-ish inclusion of cannibalistic mutants living underground in the urban centers.
Other than that, it is a good read, a lot of action-adventure mind candy.