let s understand when the president is moving or the vice president or other protected individuals, they are more vulnerable. and that s generally where the possibility will occur. many years ago, the late ra feet ka rearry was assassinated in beirut. he was in a vehicle every bit as good as president s car. the problem was they had thousands of pounds of explosives and had been able to bury it underneath a street. that level of explosive, the only way to win is to make sure the president never goes over that location. and when you re talking about all of washington or any other place that a protected individual including the president, goes they have to be able to detect in advance activity that could lead to a large explosive charge or something else that could be devastating beyond human beings ability to react. remember the kennedy assassination in dallas. that was an exception, that was a long-range sniper.