Fallout: New Vegas locations project
The barracks consists of bunk beds flanking both sides of the room with footlockers at the end of them, with a first aid box next to the bathroom door. In the bathroom, there is a dead NCR trooper; carrying a dog tag and unlootable armor. There are also various duffel bags strewn about the barracks that soldiers weren't able to pickup when they retreated out of Nelson. In between the beds are tables and some have footlockers underneath them as well. Also strewn about the room are some crates containing Sunset Sarsaparilla. There are cabinets flanking both sides of the bathroom doorway.
The Nelson barracks appears only in Fallout: New Vegas.