September 10, 2012 7:02 pm U.S. Defense Secretary Remembers Flight 93 U.S. Defense Secretary Leon Panetta had his first visit to the Flight 93 Memorial in Shanksville on Monday. Vice President Joe Biden will speak at the memorial on Tuesday. NBC10’s Doug Shimell reports. US & World Videos 2:54 UPenn leaders reiterate to pro-Palestinian protesters that they need to disband 1:44 Pro-Palestinian protesters remain on UPenn's campus despite warnings to disband 1:30 Protests calling for ceasefire continue at Penn 6:33 Family affair: Former Eagle and new Eagle Jeremiah Trotter and Jeremiah Trotter Jr. speak out 0:20 Teen girl shot in Southwest Philly, suspect in custody