This paper presents a usable graphical interface for specifying and automatically enacting access control rules for applications that involve dissemination of data among mobile tactical devices. A specific motivating example is unmanned aerial vehicles (UAVs), where the mission planner or operator needs to control the conditions under which specific receivers can access the UAV?s video feed. We implemented a prototype of this user interface as a plug-in for FalconView, a popular mission planning application.