The difference between air power and land power

T. R. Fehrenbach, in "This Kind of War." "You may fly over a land forever; you may bomb it, atomize it, pulverize it and wipe it clean of life. But if you desire to defend it, protect it, and keep it for civilization, you must do this on the ground, the way the Roman legions did, by putting your young men into the mud."

Bottom line: If a nation wants to really make a difference, they have to be there on the ground to make that difference.