The Rockefellers are known as well-heeled industrialists but in Pueblo, Colorado their name is a reminder of the Ludlow Massacre, a bloody chapter in history. On Friday, David Rockefeller Jr. will visit Pueblo, marking the first time a Rockefeller has returned to the city to address its dark past.  Also, as the U.S. Air Force hits its 70th birthday, we profile the Air Force Academy Band, which has commissioned new music to commemorate the anniversary.