The Voice Communication Understanding System (VCUS) designed for Air traffic Control is conceived as part of the cockpit automation and ground-based automation prototypes that support SPO feasibility assessment studies within NASA. In addition to supporting SPO operations, the VCUS that enables real-time and post-flight analysis of pilot-controller voice communications can directly benefit human-in-the-loop (HITL) experiments conducted at numerous NASA simulation facilities identified in an FAA/NASA NextGen Human Factors Research Coordinate Plan. The Voice Communication Understanding System (VCUS) will benefit air traffic control training facilities, including the FAA Academy at the Mike Monroney Aeronautical Center in Oklahoma City, OK, and DoD training facilities such as the Naval Air Technical Training Center (NATTC) in Pensacola, FL. VCUS would also benefit the Army PEO Aviation, which calls for voice communication understanding capability for supporting the manned-unmanned teaming training. In addition, VCUS can be integrated with the Speech-Enabled Simulation Interface Agent (SESIA) currently under development. The integrated product can be adapted for other simulation facilities within the FAA for supporting HITL experiments.