http://www.democratandchronicle.com/apps/pbcs.dll/article?AID=/20080605/OPINION02/806050353/1039/OPINION June 5, 2008 Robert F. Kennedy’s assassination still moves a retired air force officer. John E. Norvell Guest essayist In 1968, I was a brand-new Air Force second lieutenant newly arrived in Washington, D.C. On Jan. 23, 1968, the USS Pueblo, a Navy vessel on an intelligence mission off the coast of North Korea,…