Lead narrative designer Mary DeMarle said:

“Namir is linked to Belltower in both the game and the book. The elite black operations unit that he commands (codenamed ‘The Tyrants”) is part of Belltower’s Special Operations division. Belltower has several  departments that cater to a variety of security needs. For example, it has a “Disaster Response Unit” and a cyber-specialist division known as “Hackwall Data Protection Services.” It also has an array of M.O.S. Divisions that handle a variety of warmongering clients.  The Special Operations division is one of these divisions, and most of its operations are classified. As a member of Belltower’s regular divisions, Saxon would have known there was a special operations division, but he never would have heard the name of any of its units, operations, or soldiers. (So he would never have recognized the name “Tyrants”.)

Now, I know it might seem a bit odd to learn that a Belltower spec ops division would shoot down another unit of its company, but The Icarus Effect novel explains why this happens. As for why we never  mentioned the name “Tyrants” in the game, it was because there really wasn’t an appropriate location or way to do so that made sense. (Being that the name is so classified, no one would have mentioned it directly in any communication.)”