September 11 remains one of the most visceral moments in American history. Lt. Colonel Robert J. Darling served as the logistics lead in the White House during September 11, and joins Geoff Livingston to remember the attack through the photos. Part 1 of their discussion details what was happening in the White House from the first strike on the World Trade Center North Tower to the decisions made on Flight 93 by Vice President DIck Cheney and the passengers on Flight 93. Listen to Part 1 of this emotional episode to get the insider's perspective of one of America's most tragic and consequential days. You can learn more about Lt. Colonel Robert J. Darling and his book, "24 Hours Inside the President’s Bunker, 9/11/01" on robertjdarling.com.