Tom Clancy's Splinter Cell

In response to the growing use of sophisticated digital encryption to conceal potential threats to the United States, the National Security Agency has ushered forth the new dawn of intelligence-gathering techniques. The top-secret initiative is dubbed Third Echelon.
Its existence denied by the U.S. government, Third Echelon deploys a lone field operative. He is sharp, nearly invisible, and deadly. And he has the right to spy, steal, destroy, and assassinate to protect American freedoms.

His name is Sam Fisher. He is a Splinter Cell®.