Here is where I'd like to post some room ideas and as well to let other members of this "community" to share theirs'.

--Neutral

-Control Room: Control many items of the Facility such as lighting, door lockdown, alarms, [...].
-Janitor Closet: A room where items for janitors (Mops, brooms, cleaning trays, detergent, etc...) are being held.
-Conference Room: Contains a small table with 4+ seats on both sides and 1 on both ends.
-Nuclear Bunker: Self-Explanatory. Could contain shelves of non-perishable food and water.
-Maintenance Storage Room: A room to contain repair tools or spare parts (such as pipes or bolts) for Technicians to use.
-VACANT: Just a room that is under construction, for the looks.
-Rocket Science Research Lab: Where new prototypes for missiles are researched and discussed. It has many rooms, including a thruster testing room, assembly room, etc...

--Security Ward: A section of the Site designed for combatants only

-Guard's Locker: Self-Explanatory.
-Shooting Range: Self-Explanatory.
-Armory: Like the Guard's Locker but for more elite teams.
-Security Offices: Contains a wide room with office desks, with a catwalk balcony. Private offices for High Ranks are also held on the balcony.
-Classroom: Where they are trained.

These are all raw ideas; they can be modified or not taken, if the author reads this.