Wednesday morning of spring break 2018, we parked at the visitor center and walked across a long bridge that’s supposed to take you back in time a few hundred years, into colonial Williamsburg.  I needed coffee, so our first stop was the Liberty Lounge, which offered free coffee and snacks to veterans (or current members of the armed forces).  One of the volunteers inside was a retired F-4 pilot, so the two of us (plus my son) enjoyed discussing the evolution of military aircraft in the 20th century,…