The grounds of the U.S. Air Force Academy in Colorado Springs are packed to the gills with Air Force history. Among the legends on display is a green-colored Air Force Reserve A-10 Thunderbolt II (also known as a Warthog), positioned with its nose skyward. A closer look at that nose reveals its name: "The Chopper Popper."  How the Chopper Popper Keeps the Tradition of Nose Art Alive Nose art isn't that common in the Air Force these days, but it's not totally forbidden. The aging but plucky...