to bring up our testing which panel is one at a time. will begin with tsa administrator assistant administrator robert bray, and then follow with associate administered causes, and then liz shaver, followed by mr. carey davis, in that order. bob, thank you very much for being with us here today. >> good morning. i'd like to thank the great introduction by captain fred eissler and the invitation from everyone at alpa to speak to you today and join the forum as we continue to build our relationship between tsa and alpa. today i'll talk about risk-based security and affair -- federal air marshal service but some of the layers of security that tsa used to detect deterrence to be terrorism. as the assistant administrator of the office of law enforcement, i joined his band a distinguished guests to discuss a topic that is a primary importance to all of us to aviation and risk-based security.