"The President by himself cannot press a button and cause missiles to fly. He can only give an authenticated order which others would follow and then missiles would fly," Dr. Peter Feaver, a professor of public policy and political science at Duke University, told congressional lawmakers last year."The system is not a button that the President can accidentally lean on against the desk and immediately cause missiles to fly as some people in the public, I think, fear it would be," Feaver testified.