Ah, sorry for the terse response. I assumed you had clearances. In most of the classified world, there's secret and top secret. The department of energy (DOE) clearance that is basically equivalent to top secret is called Q. When you go to work someplace classified, they read a document to you that explains what knowledge is important to protect about the project you're working on. It's called being "read in." Someone working on building a satellite might be told that the composition of the metal alloys being used are the most important thing to protect. (I wouldn't know - never designed a satellite... just an example.) DOE deals with nuclear energy, and as a result of having that expertise, they also hold the secrets to nuclear weapons. Sometimes the names of compartments have zero meaning attached to the projects they represent. Umber, a color, might be the codeword for a missile. Sometimes it's ironic, like I would name the project to design a mosquito sized drone "Kong." I thought Q was either intentionally funny as a joke, or unintentionally funny because the person who chose the designation had bad pronunciation.