Third Echelon

Third Echelon (officially abbreviated as 3E) is was an NSA affiliated agency from the Splinter Cell Universe.

Third Echelon was founded back in 2003 by Irving Lambert, with its focus being primarily information warfare. Sam Fisher was its first Splinter Cell and is their best, being able to stop terror threats, even from the agency itself after Tom Reed took over after Lambert died and turned it corrupt.

Because of Reed's actions, Third Echelon was shut down and was succeeded by Fourth Echelon.

The B Team Storyline
The remaining members of Third Echelon joined Father's Alliance and is currently fighting the Crystal Empire's Rebel Alliance, The B Team, and Sentinel Task Force.