Carpentry tends to span beyond direct woodworking. Installing Drywall over steel studs is one example that might apply to DC construction.

>Carpentry is a skilled trade and a craft in which the primary work performed is the cutting, shaping and installation of building materials during the construction of buildings, ships, timber bridges, concrete formwork, etc.

https://en.wikipedia.org/wiki/Carpentry

I'm not sure carpenters do drywall, that's usually a specialized crew. But they might do the framing/assembly of the steel studs. And hanging doors, fitting the raised flooring, installing shelving/cabinets, etc.