Launch the Rocket is a Special mission where players must locate a large rocket, fortify, and defend in Fortnite: Save the World. There are 3 total stages to this mission, each requiring 3 BluGlo for a total of 9 BluGlo.
For the first defense stage, you must defend for 2 minutes. The next wave lasts 3 minutes and the final wave is for 4 minutes.
This mission is usually part of one of the final quests per zone, in order to gain access to the next one. This is why Twine Peaks does not contain any Launch the Rocket missions - there is no zone after it.