Tape:
http://www.lauramansfield.com/j/nnnnmn-1.rm
Gadahn could be in a living room in America.
He also references the firebombing of Dresden and Tokyo and ties them to Fallujah right before the Hiroshima and Nagasaki reference - - physical destruction of entire cities and rationalization for targeting large civilian population concentrations.
"Going the extra mile" to preemptively justify the attacks.
I'm pretty sure this is also not the first time Zawahiri extended this invitation to Islam (last call). But this time through an American voice.
Again, "going the extra mile".
"Going the extra mile" because the attack is to be of such a scale that it will inevitably create controversy even among their own radicals as to the morality of such mass death and devastation.
Remember the fatwa - - ten million.