National Geographic : 2009 Jan
PROTECTING THE PRESIDENT abroad requires months of detailed planning and the ability to improvise instantly, says retired Secret Service agent Joseph LaSorsa. Near a presidential stop in Ghana (above), a counterassault-team member scans for threats. Days later agents survey the grounds of a Hungarian airport (below). "Some governments give you a world of support," LaSorsa says. "In other places, if something bad happens, you are like a man on a deserted island."