The U.S. Army Program Executive Office (PEO) Simulation Training and Instrumentation (STRI) is using a product line approach to develop two major simulation domain products - OneSAF Objective System (OOS) for the Computer Generated Forces (CGFs) domain and the Common Training Instrumentation Architecture (CTIA) for the live training instrumentation domain. The OOS is the Army's next generation entity level brigade and below constructive simulation, specifically designed to meet the needs of the three major Army modeling and simulation (M&S) domains. OOS is based on a Product Line Architecture Framework (PLAF), which provides a mechanism to organize, categorize, and define the layered software structure to incrementally meet the OneSAF requirements. The OOS PLAF identifies functionally relevant software components that can be used as building blocks for higher level functionality. The CTIA is a product line architecture that provides the foundation by which the Live Training Transformation (LT2) product line common and product-unique components are developed and then employed by the LT2 applications. The CTIA provides its own PLAF (protocols, standards, interfaces, etc.) to leverage commonality of requirements in support of integrated exercises using multiple training range instrumentation, Tactical Engagement Simulation System (TESS), and targetry systems at Combat Training Centers, home station, institutions, and while deployed. This paper provides an overview of these two simulation products and proposes a concept whereby these two products work together in conjunction with the Army Constructive Training Federate (ACTF) and the Combined Arms Tactical Trainer (CATT) family of virtual simulators to provide a seamless Army and Joint interoperable Live-Virtual- Constructive (LVC) connectivity solution.