Shribman: Is America losing its heroes?

Earlier this month, on the 80th anniversary of D-Day, the country came to realize that only a few centenarians remain from the nearly 160,000 involved in the opening days of the invasion of occupied France. One of them, Robert Persichitti, 102, died en route to the commemoration. He had also served at Guam, Iwo Jima, and Okinawa.