Fourth Echelon was formed by President Patricia Caldwell and currently led by Sam Fisher on April 13th, 2010 when the current leader of the former Third Echelon detonated a low yield EMP wave to attack the White House and take control of the United States of America. Fourth Echelon was first revealed to the world by Ubisoft when they announced Splinter Cell Blacklist back in 2012. Any agent will go to Fifth Freedom (The freedom to kill at the person given the freedom's discretion).