In concert with the I/ITSEC '01 theme, "Warfighting Readiness Through Innovative Training Technology", this paper explores an innovative approach to enhancing the realism and hence the efficacy of training - developing the capacity for synthetic forces to act and respond emotionally. Emotions, along with moods and dispositions, have been shown to be important determiners of behaviors. They influence how situations are interpreted, how attention is focused, which actions are considered, and how these actions are executed. For example, individuals who are afraid will more readily interpret a situation as dangerous, have their focus of attention narrowed down to the source of their fear, and be biased toward actions that can reduce their level of fear. Similarly, individuals who are angry will more readily interpret others as being hostile, have their focus of attention narrowed down to the source of their anger, and be biased toward aggressive and/or retaliatory actions. Understanding and modeling variations in emotions will be crucial for producing realistic human-like behavior in synthetic forces. The Army has recognized this potential and is now emphasizing the need for such human behavioral characteristics as being vitally important to training. This paper discusses fundamental principles of emotions research and then applies these principles to the development of a computational, emotional framework for synthetic forces.