Overseer's Mission

Overseer's Mission is a side quest in Fallout 76.

Quick walkthrough
The player character needs to collect all the holotape logs left behind by the Overseer of Vault 76 in her primary quest to secure Appalachia's three nuclear missile silos.

Detailed walkthrough
There are 18 holotapes whose name start with "Overseer's log". One of them, Overseer's log - Vault 76, which can be ejected from the Overseer's office terminal in Vault 76, does not seem to be needed for this quest, as it is impossible to retrieve once the player character exits Vault 76.

Collecting the 17 other holotapes completes a Challenge, and are the only tapes necessary for this quest. With two exceptions, these holotapes are always found in an Overseer's Cache. Whenever a player character comes within the vicinity of a holotape an objective marker will appear. The player does not need to pick up the holotapes in order, but they will make more sense if they are.

In probable chronological order, the holotapes are:
 * Overseer's log - C.A.M.P. - The Overseer's camp south of Vault 76 during the quest First Contact.
 * Overseer's log - Flatwoods - At the church that is the Responders command and trading post in Flatwoods, to the right of the church's entrance.
 * Overseer's log - Morgantown - Near the Responders HQ terminal on the second floor of the Morgantown Airport terminal.
 * Overseer's log - Firehouse - The Charleston Fire Department.
 * Overseer's log - Top of the World - At Top of the World in front of the elevator doors.
 * Overseer's log - Free States - Outside of Abbie's bunker.
 * Overseer's log - Camp Venture - At Camp Venture.
 * Overseer's log - Allegheny - In Fort Defiance, close to the third floor elevator.
 * Overseer's log - McClintock - In Camp McClintock.
 * Overseer's log - Charleston - In the Charleston Capitol Building.
 * Overseer's log - Fort Defiance - Also in Fort Defiance, but close to the fourth floor elevator.
 * Overseer's log - Grafton - In Grafton, right next to the Grafton mayor.
 * Overseer's log - Site Alpha - Close to the elevator which descends into Site Alpha.
 * Overseer's log - Site Bravo - Close to the elevator which descends into Site Bravo.
 * Overseer's log - Site Charlie - At R&G Processing Services, near the Site Charlie elevator.
 * Overseer's log - Nuke launch - Close to any of the previous three holotapes, after a player on the server has nuked a target that isn't a Fissure site.
 * Overseer's log - Mountainside - The Mountainside Bed & Breakfast, north of Site Charlie, at a makeshift table outside the building; this holotape is not part of a cache

Bugs
The quest might not complete even if all the holotapes are collected.
 * This issue can appear when holotapes are collected in the wrong order, it can sometimes be fixed by playing the "Overseer's log - Mountainside" holotape after having collected all the holotapes.