The objective of this Phase I proposal is to research and develop real-time simulation-based solutions to advance network-centric warfare connectivity for Electronic Attack (EA) in a virtual battlespace. OPNET proposes to develop methodologies and simulation capabilities that enable cost effective testing and demonstration of prototype C4ISR architectures and technologies. During Phase I, OPNET will research and demonstrate the effectiveness of COTS modeling and simulation capabilities and methodologies to evaluate emerging sensor technologies used in C4ISR operations. Phase I will produce simulation methodologies that enable cost effective testing and demonstration of prototype C4ISR architectures and technologies, reducing the number of test cycles and costs associated with evaluating network attack architectures. OPNET's proposal focuses on leveraging OPNET COTS modeling and simulation (M&S) capabilities (i.e., software and methodologies) to reduce the overall cost and time associated with evaluating new network-centric warfare technologies and network attack architectures. OPNET's M&S technology has the capability to reduce the cost and risk associated with system development via System-in-the-Loop (SITL) simulations. OPNET's SITL capability provides an interface between complex simulated network environments and real hardware devices. This includes the ability to simulate the effects of network attacks and evaluate their impact on strategic and tactical network infrastructure.