The IEEE 1516 series of HLA specifications was originally approved by the IEEE Standards Activity (SA) Board in Fall 2000. Since that time, a DoD Interpretations Document for IEEE 1516 and a Dynamic Link Compatible HLA API for IEEE 1516.1 have been in active development. In addition, many new potential HLA requirements have been identified based on feedback from the various domains and application areas that comprise the HLA user community. This PSG seeks to address these requirements via a formal open review of the IEEE 1516 series of specifications. As part of this process, the PSG will incorporate those aspects of the Interpretations Document and Dynamic Link Compatible HLA API that need to become part of the core standard.