If one countersniper spots a threat, that person prepares to shoot while the other member takes on the role of "wind caller, " telling the shooter how to adjust his aim to counteract the wind.
CNN: Secret Service countersnipers hunt for real snipers
2.
"When you look at that parade on the day of the inauguration, every building that we will pass by ... has been surveyed, and that is done by the Countersniper Team, " said Secret Service director Mark Sullivan.
CNN: Secret Service countersnipers hunt for real snipers
3.
On Tuesday at the inauguration, members of the U.S. Secret Service's elite countersniper unit will be out in force, taking roof-top positions along Pennsylvania Avenue and elsewhere as the presidential motorcade glides past throngs of people for the swearing in of Barack Obama.
CNN: Secret Service countersnipers hunt for real snipers