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This paper provides an overview of the development of a real-time cyber-physical testbed for analyzing the impact of cyber events on the critical loads in a microgrid. A real-time, cyber-physical co-simulation testbed utilizing a Real Time Digital Simulator (RTDS) for simulating the power system, Common Open Research Emulator (CORE) for emulation of the communication network, and a TCP/IP based interface is used in this work. The testbed is used to simulate a Army microgrid based model for validation. Cyber-physical system simulation results demonstrates the ability of the testbed to implement the cyber attacks and analyze the impact on microgrid.