Settlement Defense Front

"Make no mistake, we will rip you from the history books. Every last trace of you gone! You will know loss. We will be the architects of your pain, we will build monuments to your destruction. The whole world will bear witness to this, our ascension. We will blot out your skies, we will bury you in darkness. Know this and know us. We are your enemy. We are the Settlement Defense Front."

- Vice Admiral Caleb Thies in the Know Your Enemy teaser trailer.

The Settlement Defense Front  is a main antagonistic faction in Call of Duty: Infinite Warfare led by Salen Kotch. They fight against the SATO and UNSA.

Overview
SetDef is composed of off-world insurgents who seek to control the solar system. They see themselves as the true inheritors of the solar system, and believe their way of life to be "stronger, more pure," than the people of[Earth. In SetDef's mind, living off-world has made them more worthy of ruling the solar system, while those who reside on Earth are weak "fat cats," living off the bounty of the off-world colonies. They value functionality over style, an attitude reflected in everything from their ships to their weapons and armor, which is modular, with everything designed to protect them from the harshness of space. They have re-purposed service robots into military roles, adding to their legions of troops. For SetDef, a true victory would mean the utter cessation of all planetary resources reaching Earth. They are willing to kill civilians, soldiers, and anyone who gets in their way