dr. peter feaver, professor of political science at duke university. thank you so much for being here today. our third witness is dr. ryan mckeon, the acting undersecretary of defense for policy during the obama administration and once a staff member as was mentioned on this committee. thank you for coming back. if all of you are very familiar, if you could summarize your comments in about five minutes, we would appreciate that. any written materials you have without objection will be entered into the record and if you could just begin and proceed in the order introduced, we would appreciate it. >> thank you and good morning, mr. chairman. good morning, senator cardin, distinguished members of the committee. it's my honor to appear today to discuss nuclear decision making, decision making. i'm also really pleased to appear with these two outstanding panelists and colleagues to my right. command and control is a critically important component of our nuclear deterrent and i applaud you for taking the time to understand it better. at the outset, i must say