Brotherhood of Steel holotag (Fallout 3)

Every member of the Brotherhood of Steel, just like soldiers of the US Army they are descended from, wears a set of two holotags around their neck. They contain essential personal and medical information about the wearer.

In Fallout 3, holotags recovered from fallen Brotherhood members can be turned in to Scribe Jameson at the Citadel in exchange for 100 caps and XP, but only BEFORE embarking on the Take It Back quest.

Locations

 * A-Ring, in the Citadel, has one.(Will define precise location as soon as possible)
 * The Mall has two. There are two dead Brotherhood of Steel initiates there, one on sandbags right in front of the Super Mutant Bunker door, other inside the mentioned Bunker, next to a table.
 * Falls Church is another location that usually has one or two. Upon reaching the location, there will be a big fight going on between Brotherhood of Steel members and Super Mutants going on. They will not be able to kill all of the enemies. Every corpse from a Brotherhood member will have a holotag.
 * Note: try to keep Paladin Hoss alive. He's essential to a minor side-quest on Falls church.