This chapter explores knowledge associated with the humanities that has been developed in practice-oriented research domains of the Swedish government to help solve societal challenges. I study the Swedish National Defense Research Establishment [Försvarets forskningsanstalt] (FOA). The concept of “borderline humanities” refers to research activities that did not abide by academic distinctions between the humanities, the social sciences, and the natural sciences. The study shows how knowledge on human culture, history, language, and beliefs developed in a research environment that drew on diverse fields of both research and practice. The chapter brings to the fore shared themes and concepts between different research fields and draws attention to how this affects the view of research impact.