Drifter (Fallout 3)

The  is a NPC who can be found in Dickerson Tabernacle Chapel, who wears an Oasis Druid Hood and wields the Reservist's Rifle. He also carries the coordinates to Oasis, though his affiliation with them is unspecified.

Unmarked quest: High Plains Drifter
The Drifter is on the top floor of the chapel. As the planks he walks on cannot be reached normally you have to kill him in a way that makes his corpse (or parts of it) fall down to the floor.

Additionally, if the Drifter is not knocked off the planks, the player can jump onto and then off the nearby podium and loot the corpse while in the air.

Loot

 * .308 Caliber Rounds
 * Combat Armor
 * Oasis Coordinates
 * Oasis Druid Hood
 * Reservist's Rifle