Quantum Security (Quansec) began life as a weapons manufacturer. Huge amounts of resources were put into RnD in order to make sure their weapon systems were the most cutting edge, and better than all competitors.
When noises began being made about the possibility of interstellar colonization, a new department was created to help research this. Quansec was among the first organizations to offer nations a colonizing package, which included a colony ship, supplies and security system/weapons for defense against indigenous fauna/rival colonies.
The Quansec security branch has some of the most high-tech weapons systems available to humans. They rely on quick, rapid response units which can deploy to meet security needs very quickly.