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Secure {MSiloLocation} and prep for launch.

Mission: Countdown Alpha, Mission: Countdown Bravo, and Mission: Countdown Charlie are repeatable main quests in Fallout 76 that trigger the launching of an intercontinental ballistic missile to a map location selected by the player character.

Quick walkthrough

Repeatable quest: Mission: Countdown
Enter the missile silo at ether Site Alpha, Site Bravo or Site Charlie.
Make a biometric ID card to bypass the security grids.
Fight through the missile silo to reach the control room.
End the lockdown by repairing the reactor.
Replace the mainframe cores (15 total).
Prepare the launch and defend the security chiefs while doing so.
Input the launch code and choose a target to complete the quest.
Reward: 50 XP
Completed. Leads to Scorched Earth
Death from Above!

Detailed walkthrough

Before starting this quest, the player character will need to acquire at least one nuclear keycard and the decrypted weekly launch code for a silo bunker.

Upon entering a silo bunker (either Site Alpha, Site Bravo, or Site Charlie), be prepared for many robot enemies. Bring energy-resistant gear and energy weapons. A highly radioactive room will also be within the silo.

Once the quest is completed, the player character will be prompted to select a blast zone target location within Appalachia for the nuclear missile. Some lower-level areas located in the western portion of Appalachia are considered to be within a "protected zone" and cannot be targeted. If fissure site Prime is targeted, the scorchbeast queen will be spawned and the Scorched Earth quest will begin. Targeting other locations will spawn higher level versions of whatever enemy is normally present in that area.

Quest stages

StageStatusDescriptionLog Entry
? Head for the Control RoomI should explore {MSiloLocation} and make my way to its Control Room.
? Find a way past the Laser GridsJust inside {MSiloLocation}, a laser grid blocks the way forward. I need to find a way to bypass the security system.
? Find a way to make a Biometric ID CardJust inside {MSiloLocation}, a laser grid blocks the way forward. In order to pass, I need to create and register a Biometric ID Card with the security system.
? Find an old Biometric ID Card
? Erase the old Biometric ID Card
? Acquire your Biometric Data
? Scanning...
? Create your Biometric ID Card
? Register your Biometric ID Card
? Find a way to end the Reactor Security Lockdown
? (Optional) Find a way to repair the Reactor{MSiloLocation}'s reactors have broken down, flooding the Reactor Area with radiation and triggering a security lockdown. I need to find a way to end the lockdown.
? (Optional) Shut down the Reactor for repairs
? (Optional) Repair the Reactor Pipes
? (Optional) Restart the Reactor
? Destroy the Mainframe Cores{MSiloLocation}'s Operations Mainframe has locked down the Operations Center. In order to break through, I need to destroy the mainframe.
? Find a way to open the Security DoorThe door leading out of {MSiloLocation}'s Storage Area is sealed. I need to find a way to open it.
? Replace the Mainframe Cores (X/15)The Facilities Mainframe in {MSiloLocation}'s Storage Area has broken down. I need to repair or find replacements for its damaged Mainframe Cores in order to restart it.
? (Optional) Find spare Mainframe Cores
? (Optional) Repair damaged Mainframe Cores
? Open the Security DoorI've repaired the Facilities Mainframe in {MSiloLocation}'s Storage Area. I should be able to use it to open the nearby door.
? Initiate Launch PrepI've entered {MSiloLocation}'s Control Room. In order to begin the launch sequence, I need to initiate Launch Prep.
? Complete Launch PrepI've entered {MSiloLocation}'s Control Room and begun Launch Prep. I need to defend the Launch Crew Chiefs until they can complete the process.
? Defend the Section Chiefs (1/1)
? Defend the Section Chiefs (X/5)
? (As necessary) Replace the Section Chiefs
?Icon checkI explored {MSiloLocation}.


  • The quest is automatically started upon taking the elevator down in any of the three silo sites.
  • Progress on this quest is removed upon leaving the server.
  • Repairing the 15 damaged mainframe cores will require 2 circuitry and 3 steel each, for a total of 30 circuitry and 45 steel.
  • After Fallout 76 patch, the Missile Silo quest rewards are only obtainable once per day.


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