Book excerpt: This article begins by describing an operational assessment that ultimately supported major quick reaction and program of record decisions by the Intelligence, Surveillance, and Reconnaissance Task Force (ISR), amd that established ISR needs which were more reflective of the actual threats faced by the customer units. From a military operations research perspective, this study and its companion efforts stand as a body of work used to drive leadership debates and decisions on these needs. In addition to evidence-based ISR case studies, this article explores the relative strengths and limitations of three methods in formulating future intelligence portfolios. In conclusion, the article offers an example of how operations research is being used today in the Army G-2 to guide portfolio decision making and provoke new innovative thinking about the application of intelligence requirements. --