This paper details a taxonomy generated for unmanned aerial vehicle (UAV) missions. Specifically, we examine the primary functions that a human operator would perform for a particular UAV mission within this taxonomy, including mission planning, management, and replanning. The goal is to understand what operator functions are common across different UAV missions in order to design robust and adaptable decision support systems. In addition to enumerating the operator functions required for each mission type, we also break down the information and functional requirements for each mission phase. The resulting requirements can aid in the design of interfaces that can be used for broad application between and across different mission types, and between UAV types as well.