You may obtain this quest from either Preston Garvey, listening to Radio Freedom or by coming upon the Settlement on your own.
- Kill the Courser
- Talk to Preston Garvey
- Random location
NOTE: This quest is only available by speaking to Preston Garvey after defeating The Institute during the main quest chain. He will tell you about a Courser who has joined a Raider group somewhere in the Commonwealth. Travel to the location he gives you and kill the Courser and as many of the other Raiders as you wish. Report back to Preston Garvey for a reward of caps.