Plemmons and Albro examine anthropological research practice and ethics, in the context of the expanding security regime in the U.S. With particular attention to the perceived value of disciplinary methods and expertise for emerging military humanitarian interventions, for which sociocultural knowledge is deemed crucial, they consider a long-standing disciplinary anxiety about “secret and clandestine” work for the security state. Exploring how anthropological knowledge is fundamentally co-produced with counterparts “in the field,” they emphasize the irreducibility of secrecy as part of research relationships. The article also seeks to sharpen appreciation for ethics as a negotiated feature of disciplinary practice.