Ten of the 20 countries involved in this week’s G20 Summit in Japan were also involved in the Korean War. Fighting in Korea ended in 1953, but no peace treaty was ever signed. Over 7,600 Americans remain missing in action in Korea — but this January, when the U.S. government identified the remains of George Schipani, that number was reduced by one. That story is the first in the “CBS This Morning Saturday” series “Who We Are.” Jeff Glor reports. Source