I Am Become Death

I Am Become Death is a main quest in Fallout 76.

Synopsis
To destroy the scorchbeasts, the dwellers need to harness Appalachia's nuclear arsenal. It's not quite as simple as pressing a button, however...

Quick walkthrough
Once you enter a silo bunker, be prepared for many robot enemies. Bring energy resistance gear and energy weapons. Eventually you will need to enter a high radiation zone.

Once you get access to the silo's Launch Control Center, enter a Nuclear keycard into the marked terminal, the decrypted Nuclear launch code in the terminal opposite, then use the main console between them to select the area to be struck by the nuke, confirm, and watch the fireworks.

Optional objective: Launch the nuke at Fissure site Prime to summon the Scorchbeast Queen.

Detailed walkthrough

 * After gaining the rank of general, dwellers need to head to the Whitespring Congressional Bunker command center. MODUS will proudly introduce the last section of the facility and invite the dweller to familiarize themselves with the automated training for officers in charge of Appalachia's automated nuclear arsenal.
 * The quest requires the dwellers to complete several steps. Fortunately, the tracking terminal at the command center allows dwellers to trigger a surveillance sweep that will give them the rough location of either a code piece or a keycard convoy (starting the Hide and Seek and Destroy repeatable quest).
 * First, the codes. Each of the three silos (at Site Alpha, Site Bravo, and Site Charlie) has its own individual launch code. These are gathered from ghoulified or scorched officers with a field radio strapped to their back. Killing them will yield a single letter/number pair necessary for decryption. The codes are automatically added at the command center and will display a seemingly random string letters and numbers. Figuring out the word also produces the code for launching a nuke.
 * If dwellers want to ensure they have the correct code, they need to access the archival terminal in the command center armory, read Gen. Santiago's notes to learn about the Fujiniya Intelligence Base. Inside, dwellers need to locate the lone terminal behind the blue fusion generators and use it to input the password from the bunker. This will produce a usable nuclear launch code.
 * Second, to input the code, dwellers require a nuclear keycard. These are ferried via automated cargobot convoys across Appalachia and collecting them is as simple as shooting down the cargobot.
 * Third, access to the silo. This is covered under Mission: Countdown.
 * The quest completes upon launching the first nuke.

Behind the scenes
The title of the quest is a reference to a passage from a Hindu text, the Bhagavad Gita, famously quoted by J. Robert Oppenheimer after the first successful test of a nuclear weapon: "Now I am become death, the destroyer of worlds."

Я стал смертью