On Sept. 11, 2001, then-Maj. Dan Caine was chief of weapons and tactics for the 121 st Fighter Squadron at Andrews Air Force Base in Maryland. Caine, now the chairman of the Joint Chiefs of Staff, tells Norah O'Donnell about jumping into action when the second plane hit the World Trade Center.
Gen. Dan Caine describes taking to the skies in fighter jet to defend U.S. on 9/11
