I Am Become Death, Fallout 76 Quest
To Launch a Nuke, I'll Need a Nuclear Keycard, a Full Set of Silo Code Pieces, and Information Regarding the Nature of the Code Pieces' Encryption. Modus'...
To launch a nuke, I'll need a Nuclear Keycard, a full set of silo Code Pieces, and information regarding the nature of the Code Pieces' encryption. MODUS' surveillance terminals can point me at the Code Pieces or a keycard. For the encryption, I can check the archives.
4.1. Acquire a Nuclear Keycard
Use the Surveillance System Terminal > Initiate Search - Nuclear Keycard Escort. You will receive a new quest - Hide and Seek and Destroy.
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4.2. Acquire a Nuclear Code Piece
There are eight code pieces for each silo (Alpha / Bravo / Charlie).
Use the Surveillance System Terminal > Initiate Search - Silo Alpha/Bravo/Charlie Code Piece. You will receive a new quest - Hide and Seek and Destroy.
4.3. Search the Archives for info on the Launch Code encryption
Use the Archival Terminal located in the adjacent room > Data Archives > Archive: Ellen Santiago {Gen.} > The Code Pieces. You will receive Fujinija Facility Password.
4.3.1. Track down information about the code encryption
Go to Mama Dolce's Food Processing.
To open the door at the end of the pipe, you must have the correct ID card - Mama Dolce's Manager ID Card.
4.3.1.1. Gain access to Mama Dolce's secure section
The Mama Dolce's Manager ID Card can be found in his office located on the top floor of the factory.
Return to the pipe, use the ID card reader, enter the Fujinija Intelligence Base, open the hatch and enter the secret rooms. In one of them find the Waste Disposal System Terminal > Enter System Command: 4Party651 > 0.0.2.8.
4.4. Launch a nuke from any silo [Decrypted Launch Code Required] (Quest completed)
To get the 8-digit launch code for specific bunker you need eight code pieces for that bunker and a message also for that bunker that you will find on the display in the The Whitespring Bunker. This is a rather complicated and time consuming process that has been described step-by-step by one of the reddit users - Step-by-step Guide to Decrypting Launch Codes.
Fortunately, for lazy people like me, there is a very nice site that will do the whole job for you. You can check it for the current week launch codes - NukaCrypt.com.
Once you have Nuclear Keycard and know the decrypted lauch code, go to the appropriate silo (Site Alpha, Site Bravo, or Site Charlie) and use the elevator to go inside.
You must now get to the Control Room located at the end of the bunker. To do this, you must complete Mission: Countdown {Missile Silo Location}.
The last thing you have to do is to insert the keycard into the Nuclear Keycard Receptacle, use the Keypad to enter the decrypted launch code and use the Targeting Computer to select where to drop a bomb.
BOOM! THE ENDGAME is waiting for you ;-)
4.4.1. (Optional) Nuke Fissure Site Prime [8+ Players Recommended]
Target Fissure Site Prime.