Correct about the highways. In most NATO countries the same is true, France, Belgium, Germany, Italy, Norway, and Britain all have specially constructed "heavy` sections close to 7,000 long that are capable of handling C-5 "Galaxy" cargo aircraft as well as C-130s and C-17s, plus every tactical attack and fighter aircraft NATO flies other than KC-135 tankers and the B-52s. There are approx. 11,000 of them all over NATO countries, with the idea of the `shell` game- you can destroy the main airfields, but trying to destroy ALL of these ad hoc landing strips some with aprons along side the reinforced cement highways would be utterly impossible. btw, the Imperial Japanese never attempted an invasion because it was a country of at that time only 61 million persons total against a country with a population of 190 million, unless every man, woman and child was involved...not `EVERY` American then (or now) owns a gun. (but many of us own MORE than 1, which kinda makes up for it...)