The Courier (quest)

The Courier is a quest in the Fallout: New Vegas add-on Lonesome Road.

Quick walkthrough
This quest is triggered by entering Ulysses' Temple for the first time during the quest The Divide. Follow the short path to a terminal. It can open the door to the main hallway, which leads to Ulysses, and also to the maintenance bot room, which contains ED-E. Rescue ED-E for the optional part of this quest. Then follow the main hallway to an elevator down to Ulysses Temple. You now have to "Deal with Ulysses". Do this however you seem fit then either attempt to stop the warheads, or launch them yourself. This ends the quest and starts either The End or The Apocalypse, depending on how you chose.