Gadzooks, if extraterrestrials ever attacked it would be over but the shouting before the 1st 24hrs were up. They would deliver the “Shock and Awe” Bush promised but could never deliver. They would know our weaknesses and have superior armament. They would knock out or disable all of our satellites, which alone would render the military of most major nations useless, especially the US. No one could communicate with anyone, the White House could not deploy or command troops, they would be blind. Their aircraft would zip by our fastest jets like a Raptor zips pass a box kite, they would slice and dice our air force like a Cuisinart making hundreds of Julianne fries. They (the aliens) could use a cocktail of weapons. They could use heavy weapons to knock out most major cities, then attack the fuel, food, and water, and mop up with toxic or biological weapons. I am sure they will be capable of making an Ebola or smallpox type weapon that would wipe out most survivors in short work. Before anyone could organize anything, it would be over and done with.