USAM will represent a valuable analysis tool that NASA researchers can use to assess the safety component of their proposed future NAS configurations, including future NextGen improvements. We believe that, in the very near future, all safety assessments will have to include a UAS component. The reason that they do not already require a UAS component is that a tool such as USAM does not exist. With the existence of USAM, safety analysis including UAS vehicles will become a possible, and ultimately required, part of all future NextGen analyses. The demand, therefore, by the research community for USAM is expected to be high. Federal Aviation Adminstration (FAA). The FAA will require a system to methodically compute the probabilities of hull loss, separation violations, collisions, and the risk to the public, before approving any change to the NAS which allows UAS flights. A tool such as USAM plus other extant FAA analysis techniques will be needed to compute such an assessment. Other government and commercial. Any government agency or commercial organization considering using UAS in the civilian airspace for their workincluding the Department of Homeland Security, the Department of Defense, local police departments, UAS manufacturers, UAS users, and so forthwill need a tool like USAM to assess the risk of each mission before flying them. With the information provided by USAM, such agencies can modify their flight plans if necessary or modify the parameters of the mission to ensure that the computed safety probabilities are within tolerable limits.