A field agentu2019s basic role is to gather evidence and intelligence, to stop crime. Itu2019s an investigative role. Their primary objective is to gather intelligence. Whether itu2019s by infiltrating a terror cell, or gathering evidence on a drugs cartel. They work u201cin the fieldu201d which basically means theyu2019re working undercover.The Special Activities Division (SAD), is the Paramilitary wing of the CIA. Their role is to lead the covert military operations, behind enemy lines, that the President orders. They are usually backed up by special forces units such as Navy Seals, and Delta ForceWhen planning a covert military operation, like, say, the killing of Bin Laden, the CIA/SAD are sent into the country, undercover, for several months before the operation is launched. Working undercover, they scout out the locations, gather intelligence and plan the mission. Special Forces are then dropped into the country, to prmilitary support. They then launch the mission.So, it was really the CIA that led the mission to kill Bin Laden. The media donu2019t report this information because itu2019s highly classified. Seal Team 6 would be the CIAs backup.