On Tuesday, more than 42 years after Air Force Chief Master Sgt. Richard L. Etchberger died on a Laotian mountaintop, President Obama will award him the Medal of Honor, the military's highest award for bravery. But for decades even Etchberger's own children didn't know about his heroism. Cory Etchberger was in third grade in 1968, when he was told that his father had died in a helicopter accident in Southeast Asia. At age 29 he learned the truth, when the U.S. Air Force declassified his father's story. "I was stunned," he told CNN during a visit to his hometown of...