Ranger Dobson is an NCRRanger camping out in the hidden bunkers at Hidden Valley out on an NCR Correctional Facility reconnaissance mission. He is unaware of the nearby Brotherhood presence and is having problems getting his radio to work.
Still in the Dark: McNamara wants Dobson gone from the area. He can be killed or tricked into leaving (requires Speech 50). However, you cannot talk to him if your reputation with the NCR is bad. Alternatively, he can be warned about the Brotherhood of Steel; however, this will cause the quest to fail. Dobson will remove the collar from the Courier's neck and the Brotherhood will attack. If he survives, he returns to the base and the Courier will gain fame with the NCR.
If you choose to smash the broken Ham radio while Dobson is looking, he will become hostile and attack you. However, if you can make him leave the bunker after stealing the supplies and then smash the radio, the quest should complete and Dobson will not attack you.
If you choose the Speech check to complete the objectives, the next time you return to the bunker you can still find him there about to depart. Beware of a great amount of grenade bouquets which are enough to fill the whole place with explosions. Dobson will also have left an accompanying note.
His journal in his hide-out can be read in two stages. Entry one before having met McNamara and starting Still in the Dark, the other three entries after starting this quest.
ps3 Dobson may appear in the Southern Hidden Valley Bunker, although he will be invisible. The "talk" button will still appear but it will do nothing. Shooting near him in this state will make him say things like, "Watch where you're shooting". [verified]
xbox360 Sometimes, if Dobson survives the encounter with the Brotherhood, the player may still not gain any reputation from the NCR. [verified]
pcxbox360 He sometimes may be found just outside of Hidden Valley, although everything else is the same except his position. You can still talk to him about leaving the bunker. [verified]