Following in His Footsteps Following in His Footsteps is a main quest in " Fallout 3 " . It is also an Achievement on the Xbox 360 and PC ; and a Bronze Trophy on the PlayStation 3 . Detailed walkthrough . NOTE : Where it says optional , it means the player character can skip the parts before it , like going straight to Smith Casey ' s Garage will finish the quest and the player character will not have to go to Rivet City . Megaton and ' 300 Pieces of Silver ' . Objective : Investigate the nearby town of Megaton for information about James . In Megaton , everyone will point you to the saloon owner , Colin Moriarty who will offer to tell you where your dad is if you give him 100 caps . If you do not accept the offer , he will ask for 300 the next time you talk to him . You can also use Speech to convince Moriarty that your father told you about him or choose certain dialogue options to get him to give you a discount , provided you agree to kill Silver and bring back the caps she stole . You can find Silver northwest of Megaton at Springvale , inside a ranch house . There are seven ways of dealing with her : If you choose the bad Karma way to interact with Moriarty , you can steal the password to his terminal out of a cabinet next to it or you can pass a Speech check with Gob , that will tell you about Moriarty ' s terminal and if you ask him about the terminal after the Speech check he will tell you that Nova has the password , then you can try to pass a Speech check or use Lady Killer ( male character ) to seduce her into giving you the password . Or you can simply kill Gob and loot the password off his dead body ( make sure you speak to each named person in his saloon to obtain side quests ) . However you obtain the information , it leads you to Galaxy News Radio . Galaxy News Radio . Head to the Super - Duper Mart and from there across the Potomac to Farragut West Metro station . A room with mole rats has a stairway leading downwards . Then climb more stairs to find a chain gate with feral ghouls behind it . Beyond that will be yet another stairway and a door to Tenleytown / Friendship station . If you follow the tunnels south , you should exit in Chevy Chase , but watch out for super mutants and more ghouls . You can also enter Tenleytown / Friendship station from Friendship Heights but this will involve a difficult battle with the raiders defending the entrance , as well as more ghouls inside . Near the exit to Chevy Chase North the PC will find Sentinel Sarah Lyons with a squad of Brotherhood of Steel soldiers from Lyons ' Pride . If talked to , Sarah will allow the PC to accompany her squad to the GNR building plaza , clearing out the super mutants in the nearby Early Dawn Elementary School in the process . The PC may then aid the Pride in an assault on the super mutant s , super mutant brutes , and super mutant masters attacking the Galaxy News Radio building . Once the other mutants are dead , a super mutant behemoth is unleashed from behind a destroyed bus ( watch out for it exploding when Initiate Reddin goes near it ) , which the PC may optionally help destroy . It is best advised to pick up the Fat Man nuclear launcher off the dead body of the Brotherhood soldier in the central fountain ( there is a map marker pointing to it ) as this will heavily damage the behemoth . Depending on how fast you take the behemoth down and who dies in the process , your conversation with the remaining soldiers goes differently . Use the intercom to the right of the door to get inside the GNR Building . Once inside , talk to Three Dog . You have two options at this point . If you have high enough speech , you can convince him that after you have rescued your father he will help the cause . Doing this will give you the Scientific Pursuits quest for free . However if you have insufficient speech , he will give you the Galaxy News Radio quest , which you will have to complete first to get Scientific Pursuits . If you used speech successfully , make sure to talk to Three Dog again . He will offer to exchange the location of a large cache of military munitions in return for the Galaxy News Radio quest . This allows you to explore the quest for greater returns . The Search Continues . Killing Three Dog without getting him to tell you to go to Rivet City ends the GNR quest and starts a new quest called The Search Continues . The objective is still to find Dad , your father can still be found at Vault 112 and you can still talk to Dr . Li . You do not get an achievement because it might be considered an " unmarked " quest , even though you can put it as an active quest on the Pip - Boy 3000 . Skipping this quest . Note that this quest can be fast - tracked by skipping several steps : If you end up finding Vault 112 before visiting Three Dog at GNR building plaza , this entire quest will be marked as completed . If you make it to the building , you ' ll still encounter all the super mutants ( including the behemoth ) with no Brotherhood of Steel soldiers in sight . ( This will also happen if you speak to Li or retrieve the Journals first ) . The door to GNR will be locked but if you use the intercom after the mutants have all been killed , the Brotherhood of Steel soldiers stationed inside will let you in . You can then speak to Three Dog and get the achievement for Following in His Footsteps . Additionally , he ' ll offer you the Galaxy News Radio quest in exchange for the key and coordinates to Hamilton ' s Hideaway . If you take this quest as normal and choose to find out about Dad on your own , e . g . from Doctor Li or from Vault 112 , returning afterwards to place the satellite dish , Three Dog will remark on how you didn ' t need to do as he asked , as you already had what you wanted . You will receive good Karma and the key to the weapons cache at Hamilton ' s Hideaway for your troubles and for " fighting the good fight " .