Romilly is an NPC in South America, located in the Mission Control Building next to South America's spawn. His purpose is to prompt a quest, once this quest is completed, you receive the nuke part at your base.
Location[]
Romilly is found in the Mission Control in South America, the building is right next to spawn. Despite its size, the building doesn't have that many decorations/rooms.
Purpose[]
The purpose of Romilly is to prompt you for a quest. The quest consists of finding the underground city at Callisto. Once you find the city, return to Romilly and speak to him again. He will then give you the nuke part to attach to your ship, used to nuke Callisto causing an alien invasion.
Trivia[]
The outside of Mission Control is detailed, however the inside is not realistic, as real-life Mission Control has got tons of computers, screens, etc. to control a spaceship. Also if you spawn right as the Earth is 1-2 minutes away from colliding with Nibiru, a huge lake will form and the spawn will float above it, making the task of reaching Mission Control/meeting Romilly almost impossible.
Romilly may or may not be a reference to the hit 2014 film Interstellar, where one of the characters is named Romilly.