CHAIRMAN GREETING Army Gen. Martin E. Dempsey, chairman of the Joint Chiefs of Staff, greets Ted Koppel, special correspondent for NBC's "Rock Center," before they sit down for an interview at the Pentagon, Jan. 14, 2013. The interview aired Jan. 24. SHARE IMAGE: Download Image: Full Size (0.06 MB) Photo By: VIRIN: 677659-J-TPF49-892.jpg Photo Gallery