How to unlock: talk to merchant Deb in Bunker Hill (M5,25)
It is recommended that you complete this quest before the Battle of Bunker Hill. Talk to Deb, and she will task you with clearing the National Guard Training Yard of ghouls.
You need to kill ghouls in the building and around it, they have been marked on the radar. You receive information on completion of the quest, after you kill them all. Return to Deb for the reward. You do not need to worry about turrets, only ghouls are your target.
Rewards for completing the quest: Experience points, 175 caps