In a lot of real-time strategy games I've played (Age of Empires II, Warcraft III, and StarCraft II come to mind), some of the levels of the single-player campaign usually involve you controlling a handful of units and achieving your objective without managing a base. Typically these levels are laid-out linearly, with a set path or series of paths for you to follow until a pre-defined endpoint. The game will also usually give you more units along the way as a means to replenish your army. There is no base building or economy management involved the level, though occasionally you might get access to a few unit-production buildings to also replenish your army.
These levels seem like such a common occurrence in RTS's that I'm wondering if there's a term for them? "No base building" seems like a bit of a clunky name for it.